CVE-2021-41349

MEDIUMNVD 6.59.0▲Elevated

6.5

Microsoft Exchange Server Spoofing Vulnerability

CVSS v3: 6.5
EG Score: 9.0(high)
EPSS: 99.6%
KEV: Not listed

Published

November 10, 2021

Last Modified

November 21, 2024

References (2)

secure@microsofthttps://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-41349
af854a3a-2127-422b-91ae-364da2661108https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-41349

All Vendor Advisories

(1)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Microsoft MSRCCVE-2021-413492021-11-09
Microsoft Exchange Server Spoofing Vulnerability

Data Freshness Timeline

(refreshed 7× in last 7d / 20× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

2026-06-07 15:23 UTCEPSS rescore
2026-06-07 15:23 UTCEPSS rescore
2026-06-05 22:45 UTCEPSS rescore
2026-06-05 06:09 UTCEPSS rescore
2026-06-05 06:09 UTCEPSS rescore
2026-06-04 13:10 UTCEPSS rescore
2026-06-04 13:10 UTCEPSS rescore
2026-06-02 20:11 UTCEPSS rescore
2026-06-02 20:11 UTCEPSS rescore
2026-06-01 13:50 UTCEPSS rescore
2026-06-01 13:50 UTCEPSS rescore
2026-05-31 22:29 UTCEPSS rescore
2026-05-31 22:29 UTCEPSS rescore
2026-05-31 00:15 UTCEPSS rescore
2026-05-31 00:15 UTCEPSS rescore
2026-05-29 13:42 UTCEPSS rescore
2026-05-28 13:43 UTCEPSS rescore
2026-05-28 13:43 UTCEPSS rescore
2026-05-27 13:39 UTCEPSS rescore
2026-05-27 13:39 UTCEPSS rescore

Publicly available exploits

(2 references)

Working exploit code is in the public domain (1 GitHub PoC). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

GitHub PoC0xrobiul/CVE-2021-41349
First seen Jul 30, 2022
Microsoft Exchange Server Spoofing Vulnerability Exploit!
Open source ↗
Nucleihttp/cves/2021/CVE-2021-41349.yaml
First seen Jan 1, 2021
Microsoft Exchange Server Pre-Auth POST Based Cross-Site Scripting
Open source ↗

Frequently asked(5)

What is CVE-2021-41349?

CVE-2021-41349 is a medium vulnerability published on November 10, 2021. Microsoft Exchange Server Spoofing Vulnerability

When was CVE-2021-41349 disclosed?

CVE-2021-41349 was first published in the National Vulnerability Database on November 10, 2021, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2021-41349 actively exploited?

CVE-2021-41349 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 99.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2021-41349?

CVE-2021-41349 has a CVSS v3 base score of 6.5 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.0.

How do I remediate CVE-2021-41349?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-41349, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2021-41349

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