Integer Overflow or Wraparound Affecting proftpd/proftpd package, versions [,1.3.9c)[1.3.10rc1,1.3.10rc3-2)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published22 Jul 2026
- disclosed20 Jul 2026
- creditUnknown
Introduced: 20 Jul 2026
NewCVE-2026-63091 (opens in a new tab)How to fix?
Upgrade proftpd/proftpd to version 1.3.9c, 1.3.10rc3-2 or higher.
Overview
Affected versions of this package are vulnerable to Integer Overflow or Wraparound in the mod_sftp SCP size-record parser. An attacker can cause the server to read beyond the end of SSH channel data and write overread process memory into the uploaded file by sending a specially crafted file size value, potentially exposing sensitive memory contents such as pointers to libraries and enabling further exploitation.