CVE-2021-3634

mediumPriorität · verfolgen · 28EPSS 0.047 · 92. PerzentilDEEURUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

4.68% (92nd) EPSS

CVSS 4 · medium

Is it mine?

69 products

Prüfe deine Angriffsfläche

Who says so?

5 sources

cnnvd · enisa_euvd · fstec_bdu · cert_bund

EPSS · bewertet 2026-10-27

A flaw has been found in libssh in versions prior to 0.9.6. The SSH protocol keeps track of two shared secrets during the lifetime of the session. One of them is called secret_hash and the other session_id. Initially, both of them are the same, but after key re-exchange, previous session_id is kept and used as an input to new secret_hash. Historically, both of these buffers had shared length variable, which worked as long as these buffers were same. But the key re-exchange operation can also change the key exchange method, which can be based on hash of different size, eventually creating "secret_hash" of different size than the session_id has. This becomes an issue when the session_id memory is zeroed or when it is used again during second key re-exchange.

Behebungen

Hersteller-Fix, Mitigation oder Workaround, wie von den Quellen veröffentlicht.

Ein Hersteller-Fix ist verfügbar.

Behobenlibssh-0:0.9.6-3.el8.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 8)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 After installing these updated packages, all running applications using libssh must be restarted for this update to take effect.
https://access.redhat.com/errata/RHSA-2022:2031
Behobenlibssh-0:0.9.6-3.el8.i686 as a component of Red Hat Enterprise Linux BaseOS (v. 8)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 After installing these updated packages, all running applications using libssh must be restarted for this update to take effect.
https://access.redhat.com/errata/RHSA-2022:2031
Behobenlibssh-0:0.9.6-3.el8.ppc64le as a component of Red Hat Enterprise Linux BaseOS (v. 8)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 After installing these updated packages, all running applications using libssh must be restarted for this update to take effect.
https://access.redhat.com/errata/RHSA-2022:2031
Behobenlibssh-0:0.9.6-3.el8.s390x as a component of Red Hat Enterprise Linux BaseOS (v. 8)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 After installing these updated packages, all running applications using libssh must be restarted for this update to take effect.
https://access.redhat.com/errata/RHSA-2022:2031
Behobenlibssh-0:0.9.6-3.el8.src as a component of Red Hat Enterprise Linux BaseOS (v. 8)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 After installing these updated packages, all running applications using libssh must be restarted for this update to take effect.
https://access.redhat.com/errata/RHSA-2022:2031
Behobenlibssh-0:0.9.6-3.el8.x86_64 as a component of Red Hat Enterprise Linux BaseOS (v. 8)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 After installing these updated packages, all running applications using libssh must be restarted for this update to take effect.
https://access.redhat.com/errata/RHSA-2022:2031
Behobenlibssh-config-0:0.9.6-3.el8.noarch as a component of Red Hat Enterprise Linux BaseOS (v. 8)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 After installing these updated packages, all running applications using libssh must be restarted for this update to take effect.
https://access.redhat.com/errata/RHSA-2022:2031
Behobenlibssh-debuginfo-0:0.9.6-3.el8.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 After installing these updated packages, all running applications using libssh must be restarted for this update to take effect.
https://access.redhat.com/errata/RHSA-2022:2031
Behobenlibssh-debuginfo-0:0.9.6-3.el8.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 8)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 After installing these updated packages, all running applications using libssh must be restarted for this update to take effect.
https://access.redhat.com/errata/RHSA-2022:2031
Behobenlibssh-debuginfo-0:0.9.6-3.el8.i686 as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 After installing these updated packages, all running applications using libssh must be restarted for this update to take effect.
https://access.redhat.com/errata/RHSA-2022:2031
Behobenlibssh-debuginfo-0:0.9.6-3.el8.i686 as a component of Red Hat Enterprise Linux BaseOS (v. 8)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 After installing these updated packages, all running applications using libssh must be restarted for this update to take effect.
https://access.redhat.com/errata/RHSA-2022:2031
Behobenlibssh-debuginfo-0:0.9.6-3.el8.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 After installing these updated packages, all running applications using libssh must be restarted for this update to take effect.
https://access.redhat.com/errata/RHSA-2022:2031
Behobenlibssh-debuginfo-0:0.9.6-3.el8.ppc64le as a component of Red Hat Enterprise Linux BaseOS (v. 8)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 After installing these updated packages, all running applications using libssh must be restarted for this update to take effect.
https://access.redhat.com/errata/RHSA-2022:2031
Behobenlibssh-debuginfo-0:0.9.6-3.el8.s390x as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 After installing these updated packages, all running applications using libssh must be restarted for this update to take effect.
https://access.redhat.com/errata/RHSA-2022:2031
Behobenlibssh-debuginfo-0:0.9.6-3.el8.s390x as a component of Red Hat Enterprise Linux BaseOS (v. 8)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 After installing these updated packages, all running applications using libssh must be restarted for this update to take effect.
https://access.redhat.com/errata/RHSA-2022:2031
Behobenlibssh-debuginfo-0:0.9.6-3.el8.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 After installing these updated packages, all running applications using libssh must be restarted for this update to take effect.
https://access.redhat.com/errata/RHSA-2022:2031
Behobenlibssh-debuginfo-0:0.9.6-3.el8.x86_64 as a component of Red Hat Enterprise Linux BaseOS (v. 8)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 After installing these updated packages, all running applications using libssh must be restarted for this update to take effect.
https://access.redhat.com/errata/RHSA-2022:2031
Behobenlibssh-debugsource-0:0.9.6-3.el8.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 After installing these updated packages, all running applications using libssh must be restarted for this update to take effect.
https://access.redhat.com/errata/RHSA-2022:2031
Behobenlibssh-debugsource-0:0.9.6-3.el8.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 8)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 After installing these updated packages, all running applications using libssh must be restarted for this update to take effect.
https://access.redhat.com/errata/RHSA-2022:2031
Behobenlibssh-debugsource-0:0.9.6-3.el8.i686 as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 After installing these updated packages, all running applications using libssh must be restarted for this update to take effect.
https://access.redhat.com/errata/RHSA-2022:2031
Behobenlibssh-debugsource-0:0.9.6-3.el8.i686 as a component of Red Hat Enterprise Linux BaseOS (v. 8)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 After installing these updated packages, all running applications using libssh must be restarted for this update to take effect.
https://access.redhat.com/errata/RHSA-2022:2031
Behobenlibssh-debugsource-0:0.9.6-3.el8.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 After installing these updated packages, all running applications using libssh must be restarted for this update to take effect.
https://access.redhat.com/errata/RHSA-2022:2031
Behobenlibssh-debugsource-0:0.9.6-3.el8.ppc64le as a component of Red Hat Enterprise Linux BaseOS (v. 8)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 After installing these updated packages, all running applications using libssh must be restarted for this update to take effect.
https://access.redhat.com/errata/RHSA-2022:2031
Behobenlibssh-debugsource-0:0.9.6-3.el8.s390x as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 After installing these updated packages, all running applications using libssh must be restarted for this update to take effect.
https://access.redhat.com/errata/RHSA-2022:2031
Behobenlibssh-debugsource-0:0.9.6-3.el8.s390x as a component of Red Hat Enterprise Linux BaseOS (v. 8)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 After installing these updated packages, all running applications using libssh must be restarted for this update to take effect.
https://access.redhat.com/errata/RHSA-2022:2031
Behobenlibssh-debugsource-0:0.9.6-3.el8.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 After installing these updated packages, all running applications using libssh must be restarted for this update to take effect.
https://access.redhat.com/errata/RHSA-2022:2031
Behobenlibssh-debugsource-0:0.9.6-3.el8.x86_64 as a component of Red Hat Enterprise Linux BaseOS (v. 8)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 After installing these updated packages, all running applications using libssh must be restarted for this update to take effect.
https://access.redhat.com/errata/RHSA-2022:2031
Behobenlibssh-devel-0:0.9.6-3.el8.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 After installing these updated packages, all running applications using libssh must be restarted for this update to take effect.
https://access.redhat.com/errata/RHSA-2022:2031
Behobenlibssh-devel-0:0.9.6-3.el8.i686 as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 After installing these updated packages, all running applications using libssh must be restarted for this update to take effect.
https://access.redhat.com/errata/RHSA-2022:2031
Behobenlibssh-devel-0:0.9.6-3.el8.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 After installing these updated packages, all running applications using libssh must be restarted for this update to take effect.
https://access.redhat.com/errata/RHSA-2022:2031
Behobenlibssh-devel-0:0.9.6-3.el8.s390x as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 After installing these updated packages, all running applications using libssh must be restarted for this update to take effect.
https://access.redhat.com/errata/RHSA-2022:2031
Behobenlibssh-devel-0:0.9.6-3.el8.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 After installing these updated packages, all running applications using libssh must be restarted for this update to take effect.
https://access.redhat.com/errata/RHSA-2022:2031

cvss

Technischer Schweregrad, 0–10. Eine Zeile je Quelle.

6.5

010

Basiswert 0–10 · höher = schwerwiegender · Vektor überfahren zum Auflösen⚠ Quellen uneinig · low–medium · 3.5–6.5

v2.04mediumAV:N/AC:L/Au:S/C:N/I:N/A:Pprimary · NVD / NIST USAusnutzbarkeit 8 · Auswirkung 2.9

v3.16.5mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:Hprimary · NVD / NIST USAusnutzbarkeit 2.8 · Auswirkung 3.6

v3.16.5mediumAV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:Hsecondary · FSTEC (BDU) RU

v3.16mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:Usecondary · CVSS-BT (t0sche)

v3.13.5lowCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:Lsecondary · Red Hat Product Security US

schwächen

Die CWE-Schwächeklassen, zu denen dies gehört.

CWE-787USprimärCWE-119USCWE-787USCWE-787US

betroffene Produkte (69)

Betroffene Produkte und Versionsbereiche.

Dell PowerProtect Data Domainalle Versionencert_bundDEcpe:/a:dell:powerprotect_data_domain:-
Dell PowerProtect Data Domain <7.10.1.40alle Versionencert_bundDE
Dell PowerProtect Data Domain <7.13.1.10alle Versionencert_bundDE
Dell PowerProtect Data Domain <7.7.5.50alle Versionencert_bundDE
Dell PowerProtect Data Domain <8.1.0.0alle Versionencert_bundDE
Dell PowerProtect Data Domain Management Centeralle Versionencert_bundDEcpe:/a:dell:powerprotect_data_domain_management_center:-
Dell PowerProtect Data Domain OSalle Versionencert_bundDEcpe:/o:dell:powerprotect_data_domain_os:-
SUSE Linuxalle Versionencert_bundDEcpe:/o:suse:suse_linux:-
Dell PowerProtect Data Domain< 7.10.1.40cert_bundDE
Dell PowerProtect Data Domain< 7.13.1.10cert_bundDE
Dell PowerProtect Data Domain< 7.7.5.50cert_bundDE
Dell PowerProtect Data Domain< 8.1.0.0cert_bundDE
n/a libssh≤ libssh 0.9.6enisa_euvdEU
Canonical Ltd. Ubuntu≤ 21.10fstec_bduRU
Canonical Ltd. Ubuntu≤ 20.04fstec_bduRU
Fedora Project Fedora≤ 35fstec_bduRU
Fedora Project Fedora≤ 34fstec_bduRU
Fedora Project Fedora≤ 33fstec_bduRU
IBM Corp. IBM Robotic Process Automation≤ 21.0.3fstec_bduRU
Red Hat Inc. Red Hat Enterprise Linux≤ 8fstec_bduRU

20 von 69 angezeigt

Advisories (3)

Hersteller- und Ökosystem-Meldungen dazu.

RHSA-2022:2031Red Hat Security Advisory: libssh security, bug fix, and enhancement update2022-05-10csaf · redhat_csafUS
An update for libssh is now available for Red Hat Enterprise Linux 8. Red Hat Product Security has rated this update as having a security impact of Low. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
WID-SEC-W-2022-0001libssh: Schwachstelle ermöglicht Umgehen von SicherheitsvorkehrungenDeutsch2021-08-26csaf · cert_bundDE
Ein entfernter, authentisierter Angreifer kann eine Schwachstelle in libssh ausnutzen, um Sicherheitsvorkehrungen zu umgehen.
WID-SEC-W-2024-3377Dell PowerProtect Data Domain: Mehrere SchwachstellenDeutsch2024-11-07csaf · cert_bundDE
Ein lokaler Angreifer kann mehrere Schwachstellen in Dell PowerProtect Data Domain ausnutzen, um seine Privilegien zu erhöhen, Informationen offenzulegen und um nicht näher beschriebene Auswirkungen zu erzielen.

auch bekannt als (4)

Weitere Namen und Kennungen dieser Entität.

quellen

Welche Quellen diesen Datensatz belegen und wann.

cnnvd enisa_euvd fstec_bdu cert_bund redhat_csaf NVD CVE.org MITRE

veröffentlicht 2021-08-31geändert 2026-06-17

verwandt (16,124)

Verwandte Einträge.

ID	Schweregrad	EPSS	ausnutzbar	veröffentlicht
CVE-2026-86950US	—OT kritisch	26.2% (98th)	KEV	2026-09-28
An out-of-bounds write issue was addressed with improved bounds checking. This issue is fixed in iOS 18.7.11 and iPadOS 18.7.11, iOS 26.7.1 and iPadOS 26.7.1, macOS Sequoia 15.8.1,…
CVE-2026-87491US	—OT kritisch	3.51% (89th)	KEV	2026-09-09
Out of bounds write in V8 in Google Chrome prior to 153.0.8010.36 allowed a remote attacker to execute arbitrary code inside the sandbox via a crafted HTML page. (Chromium security…
CVE-2026-53362US	—OT kritisch	0.71% (53rd)	KEV	2026-07-04
In the Linux kernel, the following vulnerability has been resolved: ipv6: account for fraggap on the paged allocation path In __ip6_append_data(), when the paged-allocation branc…
CVE-2026-53266US	—OT kritisch	0.93% (61st)	KEV	2026-06-25
In the Linux kernel, the following vulnerability has been resolved: netfilter: bridge: make ebt_snat ARP rewrite writable The ebtables SNAT target keeps the Ethernet source addre…
CVE-2026-11645US	—OT kritisch	2.44% (84th)	KEV	2026-06-09
Out of bounds read and write in V8 in Google Chrome prior to 149.0.7827.103 allowed a remote attacker to execute arbitrary code inside a sandbox via a crafted HTML page. (Chromium…

+16119 weitere

Referenzen (70)

Externe Belege — Patches, Meldungen, Analysen.

scry

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