CVE-2021-26855

highPriorität · handeln · 90OT-Risiko · kritischKEV · ausgenutztEPSS 1.000 · 100. PerzentilExploit · waffenfähigEURUUS

grimoire priorityP0 · Act now

Exploitable?

Yes · in the wild

CISA KEV · 60 exploits · waffenfähig

Likely / severe?

100.0% (100th) EPSS

CVSS 7.5 · high

Is it mine?

99 products

Prüfe deine Angriffsfläche

Who says so?

4 sources

cnnvd · enisa_euvd · fstec_bdu · msrc_csaf

hinzugefügt 2021-11-03beheben bis 2022-05-03

erforderliche Maßnahme Apply updates per vendor instructions.

EPSS · bewertet 2026-10-24

Microsoft Exchange Server Remote Code Execution Vulnerability

Behebungen

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

Ein Hersteller-Fix ist verfügbar.

BehobenMicrosoft Exchange Server 2013 Cumulative Update 21msrc_csaf
15.00.1395.012:Security Update:https://support.microsoft.com/help/5000871
https://support.microsoft.com/help/5000871
BehobenMicrosoft Exchange Server 2013 Cumulative Update 22msrc_csaf
15.00.1473.006:Security Update:https://support.microsoft.com/help/5000871
https://support.microsoft.com/help/5000871
BehobenMicrosoft Exchange Server 2013 Cumulative Update 23msrc_csaf
15.00.1497.012:Security Update:https://support.microsoft.com/help/5000871
https://support.microsoft.com/help/5000871
BehobenMicrosoft Exchange Server 2016 Cumulative Update 10msrc_csaf
15.01.1531.012:Security Update:https://support.microsoft.com/help/5000871
https://support.microsoft.com/help/5000871
BehobenMicrosoft Exchange Server 2016 Cumulative Update 11msrc_csaf
15.01.1591.018:Security Update:https://support.microsoft.com/help/5000871
https://support.microsoft.com/help/5000871
BehobenMicrosoft Exchange Server 2016 Cumulative Update 12msrc_csaf
15.01.1713.010:Security Update:https://support.microsoft.com/help/5000871
https://support.microsoft.com/help/5000871
BehobenMicrosoft Exchange Server 2016 Cumulative Update 13msrc_csaf
15.01.1779.008:Security Update:https://support.microsoft.com/help/5000871
https://support.microsoft.com/help/5000871
BehobenMicrosoft Exchange Server 2016 Cumulative Update 14msrc_csaf
15.01.1847.012:Security Update:https://support.microsoft.com/help/5000871
https://support.microsoft.com/help/5000871
BehobenMicrosoft Exchange Server 2016 Cumulative Update 15msrc_csaf
15.01.1913.012:Security Update:https://support.microsoft.com/help/5000871
https://support.microsoft.com/help/5000871
BehobenMicrosoft Exchange Server 2016 Cumulative Update 16msrc_csaf
15.01.1979.008:Security Update:https://support.microsoft.com/help/5000871
https://support.microsoft.com/help/5000871
BehobenMicrosoft Exchange Server 2016 Cumulative Update 17msrc_csaf
15.01.2044.013:Security Update:https://support.microsoft.com/help/5000871
https://support.microsoft.com/help/5000871
BehobenMicrosoft Exchange Server 2016 Cumulative Update 18msrc_csaf
15.01.2106.013:Security Update:https://support.microsoft.com/help/5000871
https://support.microsoft.com/help/5000871
BehobenMicrosoft Exchange Server 2016 Cumulative Update 19msrc_csaf
15.01.2176.009:Security Update:https://support.microsoft.com/help/5000871
https://support.microsoft.com/help/5000871
BehobenMicrosoft Exchange Server 2016 Cumulative Update 8msrc_csaf
15.01.1415.010:Security Update:https://support.microsoft.com/help/5000871
https://support.microsoft.com/help/5000871
BehobenMicrosoft Exchange Server 2016 Cumulative Update 9msrc_csaf
15.01.1466.016:Security Update:https://support.microsoft.com/help/5000871
https://support.microsoft.com/help/5000871
BehobenMicrosoft Exchange Server 2019msrc_csaf
15.02.0221.018:Security Update:https://support.microsoft.com/help/5000871
https://support.microsoft.com/help/5000871
BehobenMicrosoft Exchange Server 2019 Cumulative Update 1msrc_csaf
15.01.1979.006:Security Update:https://support.microsoft.com/help/5000871
https://support.microsoft.com/help/5000871
BehobenMicrosoft Exchange Server 2019 Cumulative Update 2msrc_csaf
15.02.0397.011:Security Update:https://support.microsoft.com/help/5000871
https://support.microsoft.com/help/5000871
BehobenMicrosoft Exchange Server 2019 Cumulative Update 3msrc_csaf
15.02.0464.015:Security Update:https://support.microsoft.com/help/5000871
https://support.microsoft.com/help/5000871
BehobenMicrosoft Exchange Server 2019 Cumulative Update 4msrc_csaf
15.02.0659.012:Security Update:https://support.microsoft.com/help/5000871
https://support.microsoft.com/help/5000871
BehobenMicrosoft Exchange Server 2019 Cumulative Update 5msrc_csaf
15.02.0595.008:Security Update:https://support.microsoft.com/help/5000871
https://support.microsoft.com/help/5000871
BehobenMicrosoft Exchange Server 2019 Cumulative Update 6msrc_csaf
15.02.0529.013:Security Update:https://support.microsoft.com/help/5000871
https://support.microsoft.com/help/5000871
BehobenMicrosoft Exchange Server 2019 Cumulative Update 7msrc_csaf
15.02.0721.013:Security Update:https://support.microsoft.com/help/5000871
https://support.microsoft.com/help/5000871
BehobenMicrosoft Exchange Server 2019 Cumulative Update 8msrc_csaf
15.02.0792.010:Security Update:https://support.microsoft.com/help/5000871
https://support.microsoft.com/help/5000871

cvss

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

9.8

010

Basiswert 0–10 · höher = schwerwiegender · Vektor überfahren zum Auflösen⚠ Quellen uneinig · high–critical · 7.5–9.8

v2.07.5highAV:N/AC:L/Au:N/C:P/I:P/A:Pprimary · NVD / NIST USAusnutzbarkeit 10 · Auswirkung 6.4

v2.07.5highAV:N/AC:L/Au:N/C:P/I:P/A:P/E:Hsecondary · CVSS-BT (t0sche)

v3.19.8criticalAV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondary · FSTEC (BDU) RU

v3.19.1criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Nsecondary · secure@microsoft.com USAusnutzbarkeit 3.9 · Auswirkung 5.2

v3.19.1criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N/E:F/RL:O/RC:Csecondary · Microsoft Security Response Center US

v3.19.1criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N/E:F/RL:O/RC:Csecondary · ENISA EU

v3.19.8criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondary · NVD / NIST USAusnutzbarkeit 3.9 · Auswirkung 5.9

SSVC

Eine Handlungsentscheidung — aus Ausnutzung und Auswirkung.

Exploitation: active · Automatable: yes · Technical Impact: totalcoordinatorcisa_ssvcUS

schwächen

Die CWE-Schwächeklassen, zu denen dies gehört.

CWE-918USprimärCWE-918US

ATT&CK-Techniken

ATT&CK-Techniken, die dies ermöglicht oder abbildet.

Exploits (60)

Öffentlicher Proof-of-Concept- und Exploit-Code.

exploit/windows/http/exchange_proxylogon_rceMicrosoft Exchange ProxyLogon RCEwaffenfähig · metasploit
auxiliary/gather/exchange_proxylogon_collectorMicrosoft Exchange ProxyLogon Collectorfunktional · metasploit
auxiliary/scanner/http/exchange_proxylogonMicrosoft Exchange ProxyLogon Scannerfunktional · metasploit
EDB-49637Microsoft Exchange 2019 - Server-Side Request Forgery (Proxylogon) (PoC)PoC · exploit_db
EDB-49663Microsoft Exchange 2019 - Server-Side Request ForgeryPoC · exploit_db
EDB-49879Microsoft Exchange 2019 - Unauthenticated Email DownloadPoC · exploit_db

betroffene Produkte (99)

Betroffene Produkte und Versionsbereiche.

Microsoft Microsoft Exchange Server 2013 Cumulative Update 2115.00.0 → publicationenisa_euvdEU
Microsoft Microsoft Exchange Server 2013 Cumulative Update 2215.00.0 → publicationenisa_euvdEU
Microsoft Microsoft Exchange Server 2013 Cumulative Update 2315.00.0 → publicationenisa_euvdEU
Microsoft Microsoft Exchange Server 2016 Cumulative Update 1015.01.0 → publicationenisa_euvdEU
Microsoft Microsoft Exchange Server 2016 Cumulative Update 1115.01.0 → publicationenisa_euvdEU
Microsoft Microsoft Exchange Server 2016 Cumulative Update 1215.01.0 → publicationenisa_euvdEU
Microsoft Microsoft Exchange Server 2016 Cumulative Update 1315.01.0 → publicationenisa_euvdEU
Microsoft Microsoft Exchange Server 2016 Cumulative Update 1415.01.0 → publicationenisa_euvdEU
Microsoft Microsoft Exchange Server 2016 Cumulative Update 1515.01.0 → publicationenisa_euvdEU
Microsoft Microsoft Exchange Server 2016 Cumulative Update 1615.01.0 → publicationenisa_euvdEU
Microsoft Microsoft Exchange Server 2016 Cumulative Update 1715.01.0 → publicationenisa_euvdEU
Microsoft Microsoft Exchange Server 2016 Cumulative Update 1815.01.0 → publicationenisa_euvdEU
Microsoft Microsoft Exchange Server 2016 Cumulative Update 1915.01.0 → publicationenisa_euvdEU
Microsoft Microsoft Exchange Server 2016 Cumulative Update 815.01.0 → publicationenisa_euvdEU
Microsoft Microsoft Exchange Server 2016 Cumulative Update 915.01.0 → publicationenisa_euvdEU
Microsoft Microsoft Exchange Server 201915.02.0 → publicationenisa_euvdEU
Microsoft Microsoft Exchange Server 2019 Cumulative Update 115.02.0 → publicationenisa_euvdEU
Microsoft Microsoft Exchange Server 2019 Cumulative Update 215.02.0 → publicationenisa_euvdEU
Microsoft Microsoft Exchange Server 2019 Cumulative Update 315.02.0 → publicationenisa_euvdEU
Microsoft Microsoft Exchange Server 2019 Cumulative Update 415.02.0 → publicationenisa_euvdEU

20 von 99 angezeigt

Advisories (1)

Hersteller- und Ökosystem-Meldungen dazu.

msrc_CVE-2021-26855Microsoft Exchange Server Remote Code Execution Vulnerability2021-03-02csaf · msrc_csafUS
To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle

auch bekannt als (4)

Weitere Namen und Kennungen dieser Entität.

quellen

Welche Quellen diesen Datensatz belegen und wann.

cnnvd enisa_euvd fstec_bdu msrc_csaf NVD CVE.org MITRE

veröffentlicht 2021-03-03geändert 2026-08-19

verwandt (4,165)

Verwandte Einträge.

ID	Schweregrad	EPSS	ausnutzbar	veröffentlicht
CVE-2026-96655US	—OT kritisch	0.46% (39th)	KEV	2026-09-23
Plex Media Server before 1.43.3.10861 allows an authenticated user to request arbitrary internal or external addresses via the '/video/:/transcode/universal' path parameter.
CVE-2026-96652US	—OT kritisch	0.46% (39th)	KEV	2026-09-23
Plex Media Server before 1.43.3.10861 allows SSRF via '/player/timeline'. An attacker using any X-Plex-Token value can include a full URL in the 'protocol' parameter and force the…
CVE-2026-83548US	—OT kritisch	8.04% (95th)	KEV	2026-09-01
A Pre-authentication SSRF vulnerability exists in the SMA1000 Appliance Work Place interface due to an unintended alternate access path. A remote unauthenticated attacker could pot…
CVE-2026-64849US	—OT kritisch	10.0% (96th)	KEV	2026-08-17
MLflow is an open source AI engineering platform for agents, large language models, and machine learning models. Prior to 3.15.0, the unauthenticated POST /api/2.0/mlflow/webhooks/…
CVE-2026-15410US	—OT kritisch	11.8% (96th)	KEV	2026-07-14
Post-authentication improper control of generation of code ('Code Injection') vulnerability has been identified in the SMA1000 Appliance Management Console (AMC) which in specific…

+4160 weitere

Referenzen (22)

Externe Belege — Patches, Meldungen, Analysen.

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