CVE-2025-57632
HIGH EPSS 41.8%
Published Sep 25, 20259mo ago · Modified Jun 17, 20261w ago
7.5 CVSS 3.1
Published Sep 25, 2025 9mo ago
Last Modified Jun 17, 2026 1w ago
Description
libsmb2 6.2+ is vulnerable to Buffer Overflow. When processing SMB2 chained PDUs (NextCommand), libsmb2 repeatedly calls smb2_add_iovector() to append to a fixed-size iovec array without checking the upper bound of v->niov (SMB2_MAX_VECTORS=256). An attacker can craft responses with many chained PDUs to overflow v->niov and perform heap out-of-bounds writes, causing memory corruption, crashes, and potentially arbitrary code execution. The SMB2_OPLOCK_BREAK path bypasses message ID validation.
CVSS Details
Base Score
Exploitability
Impact
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High
Threat Intelligence
EPSS Exploit Probability
41.8% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available
Weaknesses 1
CWE-120
References 4
- gist.github.com https://gist.github.com/ZjW1nd/0b95b63307ceee7890e88e4abc6f041e
- github.com https://github.com/sahlberg/libsmb2
- github.com https://github.com/sahlberg/libsmb2/blob/master/lib/compat.c#L569
- github.com https://github.com/sahlberg/libsmb2/commit/5e75eebf922b338cdb548d60cffb3b997d2a12e8
Remediation
No remediation data recorded yet
Check vendor advisories and the NVD entry for patch availability.