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TI-2021-12964 Aliases CVE-2021-33577GHSA-2c7q-mc2r-gx7m

An issue was discovered in Cleo LexiCom 5.5.0.0.

Priority LOW 25Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
None · Low · None
Fix status
No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA.

Summary

An issue was discovered in Cleo LexiCom 5.5.0.0. The requirement for the sender of an AS2 message to identify themselves (via encryption and signing of the message) can be bypassed by changing the Content-Type of the message to text/plain.

Why it matters now

EPSS 0.00585 48th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix No fix listed No fixed version in the sources yet

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
——all versions—No fix listedCNA
  • — Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:cleo:lexicom:5.5.0.0:*:*:*:*:*:*:*5.5.0.0VulnerableCleo
  • cpe:2.3:a:cleo:lexicom:5.5.0.0:*:*:*:*:*:*:* Versions 5.5.0.0 Vulnerable ·Cleo

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-33577
  2. 2026-10-03 Alias added: GHSA-2c7q-mc2r-gx7m

References

Exploit 1

Other 1

  • TI-2024-36997 In Cleo Harmony before 5.8.0.24, VLTrader before 5.8.0.24, and LexiCom before 5.8.0.24… KEVCVSS 3.1CRITICAL 9.8
  • TI-2024-34043 In Cleo Harmony before 5.8.0.21, VLTrader before 5.8.0.21, and LexiCom before 5.8.0.21… KEVCVSS 3.1CRITICAL 9.8
  • TI-2021-12963 An issue was discovered in Cleo LexiCom 5.5.0.0. CVSS 3.1CRITICAL 9.8

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences