CVE-2021-20235
Last modified
CVE-2021-20235 is a high-severity vulnerability rated 8.1/10 on the CVSS scale. 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. EPSS estimates a 43.86% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Zeromq | Libzmq | >= 4.2.0, < 4.3.3 |
References
- https://bugzilla.redhat.com/show_bug.cgi?id=1921983Issue Tracking, Patch, Third Party Advisory
- https://github.com/zeromq/libzmq/security/advisories/GHSA-fc3w-qxf5-7hp6Patch, Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1921983Issue Tracking, Patch, Third Party Advisory
- https://github.com/zeromq/libzmq/security/advisories/GHSA-fc3w-qxf5-7hp6Patch, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
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