CISA Alerts on Five-Year-Old GitLab SSRF Exploitation
⚠️ CISA has ordered federal agencies to patch a five-year-old GitLab SSRF vulnerability (CVE-2021-39935) that is currently being exploited in attacks. GitLab issued a fix for the server-side request forgery bug in December 2021 after it was found that unauthenticated users could reach the CI Lint API when user registration was restricted. Under BOD 22-01, affected Federal Civilian Executive Branch agencies must remediate by February 24, 2026, and CISA urges all organizations to prioritize mitigation. Shodan currently identifies over 49,000 internet-exposed GitLab instances, many reachable on default ports.
