CVE-2021-26857

mediumPriorität · handeln · 90OT-Risiko · kritischKEV · ausgenutztEPSS 0.958 · 100. PerzentilExploit · PoCEURUUS

grimoire priorityP0 · Act now

Exploitable?

Yes · in the wild

CISA KEV · 1 exploit · PoC

Likely / severe?

95.8% (100th) EPSS

CVSS 6.8 · medium

Is it mine?

107 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 2026-10-22

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 2010 Service Pack 3msrc_csaf
14.03.0513.000:Security Update:https://support.microsoft.com/help/5000978
https://support.microsoft.com/help/5000978
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 2013 Service Pack 1msrc_csaf
15.00.0847.064: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.

8.8

010

Basiswert 0–10 · höher = schwerwiegender · Vektor überfahren zum Auflösen⚠ Quellen uneinig · medium–high · 6.8–8.8

v2.06.8mediumAV:N/AC:M/Au:N/C:P/I:P/A:Pprimary · NVD / NIST USAusnutzbarkeit 8.6 · Auswirkung 6.4

v2.06.8mediumAV:N/AC:M/Au:N/C:P/I:P/A:P/E:Hsecondary · CVSS-BT (t0sche)

v3.18.8highAV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:Hsecondary · FSTEC (BDU) RU

v3.17.8highCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:Hsecondary · secure@microsoft.com USAusnutzbarkeit 1.8 · Auswirkung 5.9

v3.17.8highCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:F/RL:O/RC:Csecondary · Microsoft Security Response Center US

v3.17.8highCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:F/RL:O/RC:Csecondary · ENISA EU

v3.17.8highCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:Hsecondary · NVD / NIST USAusnutzbarkeit 1.8 · Auswirkung 5.9

SSVC

Eine Handlungsentscheidung — aus Ausnutzung und Auswirkung.

Exploitation: active · Automatable: no · Technical Impact: totalcoordinatorcisa_ssvcUS

schwächen

Die CWE-Schwächeklassen, zu denen dies gehört.

CWE-502USprimärCWE-502US

ATT&CK-Techniken

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

Exploits (1)

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

sirpedrotavares/Proxylogon-exploitproxylogon exploit - CVE-2021-26857PoC · poc_in_github

betroffene Produkte (107)

Betroffene Produkte und Versionsbereiche.

Microsoft Microsoft Exchange Server 2010 Service Pack 314.0.0.0 → publicationenisa_euvdEU
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 2013 Service Pack 115.00.0 → 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

20 von 107 angezeigt

Advisories (1)

Hersteller- und Ökosystem-Meldungen dazu.

msrc_CVE-2021-26857Microsoft 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 (3,717)

Verwandte Einträge.

ID	Schweregrad	EPSS	ausnutzbar	veröffentlicht
CVE-2026-63077US	—OT kritisch	89.6% (100th)	KEV	2026-07-27
In JetBrains TeamCity before 2026.1.3, 2025.11.7 unauthenticated remote code execution was possible via the agent polling protocol
CVE-2026-58644US	—OT kritisch	15.9% (97th)	KEV	2026-07-14
Deserialization of untrusted data in Microsoft Office SharePoint allows an unauthorized attacker to execute code over a network.
CVE-2026-50522US	—OT kritisch	3.04% (87th)	KEV	2026-07-14
Deserialization of untrusted data in Microsoft Office SharePoint allows an unauthorized attacker to execute code over a network.
CVE-2026-12569US	critical9.8OT kritisch	46.0% (99th)	KEV	2026-06-18
A critical remote code execution (RCE) vulnerability has been reported in PTC Windchill PDMlink and PTC FlexPLM. The vulnerability may be exploited through the deserialization of u…
CVE-2026-45247US	—OT kritisch	2.08% (81st)	KEV	2026-05-26
Mirasvit Full Page Cache Warmer for Magento 2 before version 1.11.12 contains a PHP object injection vulnerability that allows unauthenticated attackers to achieve remote code exec…

+3712 weitere

Referenzen (7)

Externe Belege — Patches, Meldungen, Analysen.

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