CVE-2021-33054

Name: CVE-2021-33054
Creator: NVD / NIST
Published: 2021-06-04T15:15:07.647+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 0.99%

Last modified Jun 17, 2026

CVE-2021-33054 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. SOGo 2.x before 2.4.1 and 3.x through 5.x before 5.1.1 does not validate the signatures of any SAML assertions it receives. Any actor with network access to the deployment could impersonate users when SAML is the authentication method. EPSS estimates a 0.99% chance of exploitation in the next 30 days.

Description

SOGo 2.x before 2.4.1 and 3.x through 5.x before 5.1.1 does not validate the signatures of any SAML assertions it receives. Any actor with network access to the deployment could impersonate users when SAML is the authentication method. (Only versions after 2.0.5a are affected.)

Metrics

CVSS 3.1

7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

EPSS Probability

0.99%

57.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-347

Affected Software

Vendor	Product	Versions
Inverse	Sogo	>= 2.0.6, < 2.4.1
Inverse	Sogo	>= 3.0.0, < 5.1.1
Debian	Debian Linux	9.0
Debian	Debian Linux	10.0
Debian	Debian Linux	11.0

References

https://blogs.akamai.com/2021/06/sogo-and-packetfence-impacted-by-saml-implementation-vulnerabilities.htmlThird Party Advisory
https://github.com/inverse-inc/sogo/blob/master/CHANGELOG.mdRelease Notes, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2021/07/msg00007.htmlMailing List, Third Party Advisory
https://www.debian.org/security/2021/dsa-5029Third Party Advisory
https://www.sogo.nu/news.htmlProduct
https://blogs.akamai.com/2021/06/sogo-and-packetfence-impacted-by-saml-implementation-vulnerabilities.htmlThird Party Advisory
https://github.com/inverse-inc/sogo/blob/master/CHANGELOG.mdRelease Notes, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2021/07/msg00007.htmlMailing List, Third Party Advisory
https://www.debian.org/security/2021/dsa-5029Third Party Advisory
https://www.sogo.nu/news.htmlProduct

Timeline

Published: Jun 4, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-33054?

How severe is CVE-2021-33054?

CVE-2021-33054 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 0.99% probability of exploitation in the next 30 days.

How do I fix CVE-2021-33054?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-33054?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST