User controlled parameters related to SMTP notifications are not correctly validated.

published 2021-10-05 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-18858

cvss: 6.8; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 0.8%; EPSS 0.8% chance of exploitation in 30 days, percentile 57%
public exploits: 0; none known

User controlled parameters related to SMTP notifications are not correctly validated. This can lead to a buffer overflow resulting in crashes and data leakage.

Patch / fix

fixed in 4

axis axis_os 10.7
axis axis_os_2016 6.50.5.5
axis axis_os_2018 8.40.4.3
axis axis_os_2020 9.80.3.5

Exploit prediction

0.80% chance of exploitation in the next 30 days, higher than 57% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
NVD	3.1	6.8	CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:H
NVD	2.0	4.0	AV:N/AC:H/Au:N/C:P/I:N/A:P

Affected products

Axis Communications AB AXIS OS

Classification

Weakness

CWE-122 Heap-based Buffer Overflow
CWE-787 Out-of-bounds Write

References

axis.com /files/tech_notes/CVE-2021-31986.pdf
vendor-advisory

Sources

CVE List CVE-2021-31986
NVD CVE-2021-31986

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary