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CVE-2021-33054: 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 asserti...

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.)

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

SOGo deployments using SAML authentication could let a network-accessible attacker impersonate users because SOGo did not validate SAML assertion signatures. This is an authentication trust failure, not a normal data leak bug. Business urgency depends on whether SAML login is enabled and whether the service is reachable by untrusted networks.

Executive priority

Prioritize remediation for any SOGo system using SAML, especially internet-facing or widely reachable internal deployments. User impersonation can lead to mailbox and groupware access without normal credential compromise.

Technical view

CVE-2021-33054 affects SOGo 2.x before 2.4.1 and 3.x through 5.x before 5.1.1, only after 2.0.5a. The flaw is missing validation of SAML assertion signatures, allowing user impersonation when SAML is the authentication method. The bundle provides no CVSS score, CWE, or proof of active exploitation.

Likely exposure

Exposure is likely limited to SOGo instances using SAML authentication. Risk rises when the SOGo deployment is reachable by external or broadly internal networks. Non-SAML authentication paths are not identified as affected in the provided sources.

Exploitation context

The CVE states any actor with network access to the deployment could impersonate users when SAML is used. CISA KEV is false in the bundle, and no provided source establishes active exploitation. Treat exploit status as unconfirmed.

Researcher notes

The public bundle is sparse: no CVSS, CWE, exploit evidence, or detailed patch diff is included. The strongest claims supported are affected SOGo version ranges, SAML-only authentication context, network-access attacker requirement, and fixed release thresholds.

Mitigation direction

  • Upgrade SOGo to 2.4.1, 5.1.1, or a later vendor-supported release.
  • Apply Debian security updates if using Debian-packaged SOGo.
  • Inventory whether SAML authentication is enabled for each SOGo deployment.
  • Restrict network access to SOGo while remediation is pending.
  • Check current SOGo vendor guidance for any deployment-specific instructions.

Validation and detection

  • Confirm SOGo version and whether it is after 2.0.5a but before the fixed releases.
  • Verify whether SAML is configured as an authentication method.
  • Confirm Debian hosts received the relevant DLA or DSA security update.
  • Review authentication logs for unexpected SOGo sessions or identity mismatches.
  • Avoid production exploit testing; validate through version, package, and configuration review.
Prepared
Confidence
medium
Sources
7

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

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CVE-2021-33054 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
0Timeline events
0ADP providers
6Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/an/an/aListed
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.