CVE-2021-36806
A reflected XSS vulnerability allows an open redirect when the victim clicks a malicious link to...
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.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- Required
What an attacker can affect
- Confidentiality
- None
- Integrity
- Low
- Availability
- None
Exploit likelihood
What each source reports
CVE List Score used
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.
- Record
CVE-2021-36806- CVSS 3.1
- 4.7 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N - Weakness
- CWE-79
- Updated
- 2026-11-02
EUVDEUVD-2021-23382
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.
- Record
EUVD-2021-23382- CVSS 3.1
- 4.7 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N - Updated
- 2026-11-03
GitHub AdvisoriesGHSA-f39q-q9f3-6vmw
A reflected XSS vulnerability allows an open redirect when the victim clicks a malicious link to...
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.
- Record
GHSA-f39q-q9f3-6vmw- CVSS 3.1
- 4.7 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N - Weakness
- CWE-79
- Updated
- 2026-11-02
NVD
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.
- Record
CVE-2021-36806- CVSS 3.1
- 4.7 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N - CVSS 3.1
- 6.1 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N - Weakness
- CWE-79
- Updated
- 2026-11-02
Affected products
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases, published | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-36806 is a medium vulnerability (CVSS 4.7) in Sophos Email Appliance, published November 30, 2023. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.43%, the 37th percentile. No source names a fixed version.