CVE-2021-27103

CVE-2021-27103 is a critical-severity (CVSS 9.8) vulnerability in Accellion FTA. CISA added it to the Known Exploited Vulnerabilities catalog on November 3, 2021, which means exploitation in the wild has been confirmed; US federal agencies had to remediate it by November 17, 2021. CISA also lists it as known to be used in ransomware campaigns, so it should be prioritised accordingly. Accellion has 4 vulnerabilities in the KEV catalog, 4 of them linked to ransomware.

Accellion FTA 9_12_411 and earlier is affected by SSRF via a crafted POST request to wmProgressstat.html. The fixed version is FTA_9_12_416 and later.

CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

• https://github.com/accellion/CVEs/blob/main/CVE-2021-27103.txt
• https://www.accellion.com/products/fta/
• https://github.com/accellion/CVEs/blob/main/CVE-2021-27103.txt
• https://www.accellion.com/products/fta/
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-27103