CVE-2021-20235

Severity CVSS v4.0:
Pending analysis
Type:
CWE-787 Out-of-bounds Write
Publication date:
01/04/2021
Last modified:
07/11/2023

Description

There's a flaw in the zeromq server in versions before 4.3.3 in src/decoder_allocators.hpp. The decoder static allocator could have its sized changed, but the buffer would remain the same as it is a static buffer. A remote, unauthenticated attacker who sends a crafted request to the zeromq server could trigger a buffer overflow WRITE of arbitrary data if CURVE/ZAP authentication is not enabled. The greatest impact of this flaw is to application availability, data integrity, and confidentiality.

Vulnerable products and versions

CPE From Up to
cpe:2.3:a:zeromq:libzmq:*:*:*:*:*:*:*:* 4.2.0 (including) 4.3.3 (excluding)