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Fencer Intel
medium 4.7

CVE-2021-36806 json

A reflected XSS vulnerability allows an open redirect when the victim clicks a malicious link to an error page on Sophos Email Appliance ol…

published 2y ago modified 4mo ago also EUVD-2021-23382

cvss
4.7
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 37%
public exploits
0
none known

Summary

A reflected XSS vulnerability allows an open redirect when the victim clicks a malicious link to an error page on

Sophos Email Appliance

older than version 4.5.3.4.

Patch / fix

  • sophos email_appliance 4.5.3.4

Is CVE-2021-36806 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
last yr.

Exploit prediction

0.43% chance of exploitation in the next 30 days, higher than 37% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
CNA 3.1 4.7 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N
NVD 3.1 6.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Affected products

  • Sophos Sophos Email Appliance

Classification

Weakness
  • CWE-79 Improper Neutralization of Input During Web Page Generation

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.