CVE-2021-20235
8.1
HIGH
CVSS 3.1
EPSS 6.6%
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.
How to fix CVE-2021-20235
To remediate CVE-2021-20235, upgrade the affected package to a fixed version below.
- —upgrade to 4.3.3-1 or later
Is CVE-2021-20235 being exploited?
Moderate — EPSS is 6.6%. Track this CVE but it's not at the top of the prioritisation list.
Affected packages (1)
- from 0, < 4.3.3-1
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | HIGH8.1 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H |