CVE-2021-34697

mediumPriorität · verfolgen · 34EPSS 0.013 · 71. PerzentilEURUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

1.33% (71st) EPSS

CVSS 5 · medium

Is it mine?

22 products

Prüfe deine Angriffsfläche

Who says so?

4 sources

cnnvd · enisa_euvd · fstec_bdu · cisco_csaf

EPSS · bewertet 2026-10-27

A vulnerability in the Protection Against Distributed Denial of Service Attacks feature of Cisco IOS XE Software could allow an unauthenticated, remote attacker to conduct denial of service (DoS) attacks to or through the affected device. This vulnerability is due to incorrect programming of the half-opened connections limit, TCP SYN flood limit, or TCP SYN cookie features when the features are configured in vulnerable releases of Cisco IOS XE Software. An attacker could exploit this vulnerability by attempting to flood traffic to or through the affected device. A successful exploit could allow the attacker to initiate a DoS attack to or through an affected device.

Behebungen

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

Ein Hersteller-Fix ist verfügbar.

Behoben17.11.99SWcisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
Behoben17.2.1cisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
Behoben17.2.1acisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
Behoben17.2.1rcisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
Behoben17.2.1vcisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
Behoben17.2.2cisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
Behoben17.2.3cisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
Behoben17.3.1cisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
Behoben17.3.1acisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
Behoben17.3.1wcisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
Behoben17.3.1xcisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
Behoben17.3.1zcisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
Behoben17.3.2cisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
Behoben17.3.2acisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
Behoben17.4.1cisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
Behoben17.4.1acisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
Behoben17.4.1bcisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
Behoben17.4.1ccisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
BehobenCisco IOS XE Catalyst SD-WANcisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com

cvss

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

8.6

010

Basiswert 0–10 · höher = schwerwiegender · Vektor überfahren zum Auflösen⚠ Quellen uneinig · medium–high · 5–8.6

v2.05mediumAV:N/AC:L/Au:N/C:N/I:N/A:Pprimary · NVD / NIST USAusnutzbarkeit 10 · Auswirkung 2.9

v3.18.6highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:Hprimary · NVD / NIST USAusnutzbarkeit 3.9 · Auswirkung 4

v3.15.8mediumAV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:Lsecondary · FSTEC (BDU) RU

v3.15.8mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:Lsecondary · ENISA EU

v3.15.8mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:Lsecondary · psirt@cisco.com USAusnutzbarkeit 3.9 · Auswirkung 1.4

v3.17.9highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/E:Usecondary · CVSS-BT (t0sche)

v3.15.8mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:Lsecondary · Cisco PSIRT US

SSVC

Eine Handlungsentscheidung — aus Ausnutzung und Auswirkung.

Exploitation: none · Automatable: yes · Technical Impact: partialcoordinatorcisa_ssvcUS

schwächen

Die CWE-Schwächeklassen, zu denen dies gehört.

CWE-665USprimärCWE-665US

betroffene Produkte (22)

Betroffene Produkte und Versionsbereiche.

Cisco 17.11.99SWalle Versionencisco_csafUS
Cisco 17.2.1alle Versionencisco_csafUS
Cisco 17.2.1aalle Versionencisco_csafUS
Cisco 17.2.1ralle Versionencisco_csafUS
Cisco 17.2.1valle Versionencisco_csafUS
Cisco 17.2.2alle Versionencisco_csafUS
Cisco 17.2.3alle Versionencisco_csafUS
Cisco 17.3.1alle Versionencisco_csafUS
Cisco 17.3.1aalle Versionencisco_csafUS
Cisco 17.3.1walle Versionencisco_csafUS
Cisco 17.3.1xalle Versionencisco_csafUS
Cisco 17.3.1zalle Versionencisco_csafUS
Cisco 17.3.2alle Versionencisco_csafUS
Cisco 17.3.2aalle Versionencisco_csafUS
Cisco 17.4.1alle Versionencisco_csafUS
Cisco 17.4.1aalle Versionencisco_csafUS
Cisco 17.4.1balle Versionencisco_csafUS
Cisco 17.4.1calle Versionencisco_csafUS
Cisco Cisco IOS XE Catalyst SD-WANalle Versionencisco_csafUS
Cisco Cisco IOS XE Software≤ n/aenisa_euvdEU

20 von 22 angezeigt

Advisories (1)

Hersteller- und Ökosystem-Meldungen dazu.

cisco-sa-zbfw-tguGuYqCisco IOS XE Software Protection Against Distributed Denial of Service Attacks Feature Vulnerability2021-09-22csaf · cisco_csafUS
A vulnerability in the Protection Against Distributed Denial of Service Attacks feature of Cisco IOS XE Software could allow an unauthenticated, remote attacker to conduct denial of service (DoS) attacks to or through the affected device. This vulnerability is due to incorrect programming of the half-opened connections limit, TCP SYN flood limit, or TCP SYN cookie features when the features are configured in vulnerable releases of Cisco IOS XE Software. An attacker could exploit this vulnerability by attempting to flood traffic to or through the affected device. A successful exploit could allow the attacker to initiate a DoS attack to or through an affected device. Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability. This advisory is part of the September 2021 release of the Cisco IOS and IOS XE Software Security Advisory Bundled Publication. For a complete list of the advisories and links to them, see Cisco Event Response: September 2021 Semiannual Cisco IOS and IOS XE Software Security Advisory Bundled Publication. ["https://sec.cloudapps.cisco.com/security/center/viewErp.x?alertId=ERP-74581"]

auch bekannt als (4)

Weitere Namen und Kennungen dieser Entität.

quellen

Welche Quellen diesen Datensatz belegen und wann.

cnnvd enisa_euvd fstec_bdu cisco_csaf NVD CVE.org MITRE

veröffentlicht 2021-09-23geändert 2026-06-17

verwandt (659)

Verwandte Einträge.

ID	Schweregrad	EPSS	ausnutzbar	veröffentlicht
CVE-2024-50302US	medium5.5OT kritisch	0.81% (57th)	KEV	2024-11-19
In the Linux kernel, the following vulnerability has been resolved: HID: core: zero-initialize the report buffer Since the report buffer is used by all kinds of drivers in variou…
CVE-2023-49105US	critical9.8OT kritisch	43.2% (99th)	KEV	2023-11-21
An issue was discovered in ownCloud owncloud/core before 10.13.1. An attacker can access, modify, or delete any file without authentication if the username of a victim is known, an…
CVE-2022-0847US	high7.8OT kritisch	92.8% (100th)	KEV	2022-03-10
A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe and push_pipe functions in the Linux ker…
CVE-2020-27950US	medium5.5OT kritisch	16.5% (97th)	KEV	2020-12-08
A memory initialization issue was addressed. This issue is fixed in macOS Big Sur 11.0.1, watchOS 7.1, iOS 12.4.9, watchOS 6.2.9, Security Update 2020-006 High Sierra, Security Upd…
CVE-2013-1675US	medium6.5OT kritisch	6.70% (94th)	KEV	2013-05-16
Mozilla Firefox before 21.0, Firefox ESR 17.x before 17.0.6, Thunderbird before 17.0.6, and Thunderbird ESR 17.x before 17.0.6 do not properly initialize data structures for the ns…

+654 weitere

Referenzen (7)

Externe Belege — Patches, Meldungen, Analysen.

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