VULNERABILITY INTELLIGENCE

CVE-2021-20235

CVSS score8.1 HIGH
EPSS probability43.86%
CISA KEVNot currently listed
Published2021-04-01
Last modified2026-06-17
CVSS vectorCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

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.

Weakness classification

  • secalert@redhat.com: CWE-120
  • nvd@nist.gov: CWE-787

Primary references