CVE-2021-31988
Axis Communications
- Published
- 5 October 2021
- Last modified
- 17 June 2026
- CVSS
- 8.8 v3.1
- Severity
- high
- EPSS
- 1.0% (59th pct)
- CISA KEV
- Not listed
- NVD status
- Modified
- Weaknesses
- CWE-1286, CWE-74
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Description
A user controlled parameter related to SMTP test functionality is not correctly validated making it possible to add the Carriage Return and Line Feed (CRLF) control characters and include arbitrary SMTP headers in the generated test email.
Exploitation
Not listed in the CISA Known Exploited Vulnerabilities catalogue as of 2026.09.04. That is an absence of confirmed public exploitation, not evidence that exploitation has not occurred. EPSS models a 1.0% probability of exploitation activity in the next 30 days.
Affected products
| Product | Vendor | Type | Versions named |
|---|---|---|---|
| Axis Os | Axis Communications | unknown | < 10.12.199, < 10.12.206, < 10.7, < 10.8 +41 |
| Axis Os 2016 | Axis Communications | unknown | < 6.50.5.2, < 6.50.5.5, >= 6.50.2 |
| Axis Os 2018 | Axis Communications | unknown | < 8.40.35, < 8.40.4.3 |
| Axis Os 2020 | Axis Communications | unknown | < 9.80.3.5, < 9.80.47, < 9.80.49, < 9.80.55 |
References
Vendor advisory and patch
- https://www.axis.com/files/tech_notes/CVE-2021-31988.pdf
- https://www.axis.com/files/tech_notes/CVE-2021-31988.pdf
Record assembled from NVD, CISA KEV 2026.09.04 and FIRST EPSS 2026-09-04. Affected products are those NVD's CPE configuration names that fall inside this site's scope; a CVE may affect products outside it.