CVE-2021-25273: Stored XSS can execute as administrator in quarantined email detail view in Sophos UTM before version 9.706.

Q: How do I fix CVE-2021-25273?

unified threat management: upgrade to 9.706. Exact commands for each OS are on this page.

Q: Is CVE-2021-25273 being exploited?

CVE-2021-25273 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2021-25273 affect?

CVE-2021-25273 affects unified threat management. Severity is medium (CVSS 4.8). Stored XSS can execute as administrator in quarantined email detail view in Sophos UTM before version 9.706.

Q: How urgent is CVE-2021-25273?

Priority 36/100. Public exploit reference

Routine

MEDIUM 4.8UPGRADE

CVE-2021-25273 is a medium-severity flaw (CVSS 4.8) affecting unified threat management. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Stored XSS can execute as administrator in quarantined email detail view in Sophos UTM before version 9.706.

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	4.8 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	High
User interaction	Required
EPSS exploit chance	0.8% (top 42%)
CISA exploited list	No
Weakness	CWE-79
Published	2021-07-29
Last modified	2026-06-17

Publisher (CNA): Sophos Limited · Vendor: sophos

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2021-07-29 20:15 UTCPublished CVE record published
2026-06-17 03:41 UTCUpdated Record last modified

sophos unified threat management UPGRADE

Affected: < 9.706

Fixed in: 9.706

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy unified-threat-management || rpm -q unified-threat-management || unified-threat-management --version

2. UPGRADE to 9.706 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade unified-threat-management

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade unified-threat-management

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-25273?

unified threat management: upgrade to 9.706. Exact commands for each OS are on this page.

Is CVE-2021-25273 being exploited?

CVE-2021-25273 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-25273 affect?

CVE-2021-25273 affects unified threat management. Severity is medium (CVSS 4.8). Stored XSS can execute as administrator in quarantined email detail view in Sophos UTM before version 9.706.

How urgent is CVE-2021-25273?

Priority 36/100. Public exploit reference

Software pages

Sophos vulnerabilities

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References

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