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PatchSiren cyber security CVE debrief

CVE-2021-27103 Accellion CVE debrief

CVE-2021-27103 is a server-side request forgery (SSRF) issue in Accellion FTA that CISA added to its Known Exploited Vulnerabilities catalog on 2021-11-03. The KEV entry marks it as known to be used in ransomware campaigns and directs affected organizations to apply vendor updates.

Vendor
Accellion
Product
FTA
CVSS
Unknown
CISA KEV
Listed
Original CVE published
2021-11-03
Original CVE updated
2021-11-03
Advisory published
2021-11-03
Advisory updated
2021-11-03

Who should care

Organizations that still operate Accellion FTA, as well as security teams responsible for vulnerability remediation, internet-facing file transfer systems, and KEV-driven patch management.

Technical summary

The supplied corpus identifies this issue as an SSRF vulnerability in Accellion FTA. CISA’s KEV record classifies it as actively exploited and notes known ransomware campaign use. No CVSS score was supplied in the provided data.

Defensive priority

High. KEV inclusion means this vulnerability should be treated as a remediation priority on affected systems, especially where FTA is exposed or handles sensitive data.

Recommended defensive actions

  • Apply updates per vendor instructions.
  • Verify whether any Accellion FTA instances remain in service, including legacy or forgotten deployments.
  • Prioritize remediation using the CISA KEV deadline context provided for this item.
  • Review exposure of any FTA-connected systems and limit network access where possible until patched.
  • Use authoritative vendor and government records to confirm remediation status.

Evidence notes

All statements are limited to the supplied CVE metadata and the CISA KEV source item. The corpus identifies the vulnerability as an SSRF in Accellion FTA, records it as a KEV item, and marks known ransomware campaign use. No additional technical detail or CVSS score was provided in the source corpus.

Official resources

CISA KEV metadata indicates this vulnerability was added on 2021-11-03 and is associated with known ransomware campaign use. This debrief does not include exploit details or reproduction guidance.