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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.

Sources and references

Verified primary and authoritative sources

  • CVE-2021-27103 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2021-27103

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2021-27103 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2021-27103

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

  • CISA Known Exploited Vulnerabilities catalog

    Publisher, destination, and source semantics verified

    URL: https://www.cisa.gov/known-exploited-vulnerabilities-catalog

    Cybersecurity and Infrastructure Security Agency - Official CISA catalog of vulnerabilities known to be exploited in the wild.

Supplemental references

  • Source item URL

    Unverified legacy reference

    URL: https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json

    cisa_kev

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.