CVE-2021-23840: Integer Overflow or Wraparound

February 16, 2021 (updated November 9, 2023)

Calls to EVP_CipherUpdate, EVP_EncryptUpdate and EVP_DecryptUpdate may overflow the output length argument in some cases where the input length is close to the maximum permissable length for an integer on the platform. In such cases the return value from the function call will be 1 (indicating success), but the output length value will be negative. This could cause applications to behave incorrectly or crash.

References

nvd.nist.gov/vuln/detail/CVE-2021-23840
www.openssl.org/news/secadv/20210216.txt

Detect and mitigate CVE-2021-23840 with GitLab Dependency Scanning

Secure your software supply chain by verifying that all open source dependencies used in your projects contain no disclosed vulnerabilities. Learn more about Dependency Scanning →