VULNERABILITY INTELLIGENCE

CVE-2023-3603

CVSS score3.1 LOW
EPSS probability0.90%
CISA KEVNot currently listed
Published2023-07-21
Last modified2026-06-17
CVSS vectorCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L

Description

A missing allocation check in sftp server processing read requests may cause a NULL dereference on low-memory conditions. The malicious client can request up to 4GB SFTP reads, causing allocation of up to 4GB buffers, which was not being checked for failure. This will likely crash the authenticated user's sftp server connection (if implemented as forking as recommended). For thread-based servers, this might also cause DoS for legitimate users. Given this code is not in any released versions, no security releases have been issued.

Weakness classification

  • CWE-476: NULL Pointer Dereference

Primary references