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Fencer Intel
high 8.8

CVE-2021-31988 json

A user controlled parameter related to SMTP test functionality is not correctly validated making it possible to add the Carriage Return and…

published 5y ago modified 4mo ago also EUVD-2021-18860

cvss
8.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.0%
EPSS 1.0% chance of exploitation in 30 days, percentile 61%
public exploits
0
none known

Summary

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.

Patch / fix

  • 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

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Exploit prediction

0.95% chance of exploitation in the next 30 days, higher than 61% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
NVD 2.0 6.8 AV:N/AC:M/Au:N/C:P/I:P/A:P

Affected products

  • Axis Communications AB AXIS OS

Classification

Weakness
  • CWE-1286 Improper Validation of Syntactic Correctness of Input
  • CWE-74 Improper Neutralization of Special Elements in Output Used by a Downstream Component

References

Sources

Fencer Intel 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.