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Fencer Vulns
high 7.5

CVE-2021-33054 json

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.

published 2021-06-04 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-19769

cvss
7.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.0%
EPSS 1.0% chance of exploitation in 30 days, percentile 62%
public exploits
0
none known

Summary

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.)

Patch / fix

  • inverse sogo 2.4.1, 5.1.1
  • sogo Debian 13, Debian 12 5.1.1-1

debian advisories DEBIAN-CVE-2021-33054

  • sogo Ubuntu Pro 16.04 LTS 2.2.17a-1.1ubuntu0.1~esm1
  • sogo Ubuntu Pro 18.04 LTS 3.2.10-1ubuntu0.1~esm1
  • sogo Ubuntu Pro 20.04 LTS 4.3.0-1ubuntu0.1~esm1

ubuntu advisories UBUNTU-CVE-2021-33054

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Exploit prediction

1.00% chance of exploitation in the next 30 days, higher than 62% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:P/A:N

Classification

Weakness
  • CWE-347 Improper Verification of Cryptographic Signature

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.