How severe is CVE-2021-25273?

CVE-2021-25273 has a CVSS 3.x base score of 4.8, rated medium severity. It is exploitable over network with low attack complexity, requires high privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2021-25273 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (53rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-25273?

CVE-2021-25273 affects Sophos Unified Threat Management. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-25273?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-25273 published?

CVE-2021-25273 was published on 2021-07-29 and last updated on 2026-06-17.

CVE-2021-25273

CVE-2021-25273 is a medium-severity vulnerability in Sophos Unified Threat Management with a CVSS 3.x base score of 4.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.

Key facts

Severity: Medium (CVSS 3.x base score 4.8)
CVSS v2: 3.5
EPSS exploit prediction: 1% (53rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Sophos Unified Threat Management
Published: 2021-07-29
Last modified: 2026-06-17

Description

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

Frequently asked questions

What is CVE-2021-25273?: Stored XSS can execute as administrator in quarantined email detail view in Sophos UTM before version 9.706.
How severe is CVE-2021-25273?: CVE-2021-25273 has a CVSS 3.x base score of 4.8, rated medium severity. It is exploitable over network with low attack complexity, requires high privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2021-25273 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (53rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-25273?: CVE-2021-25273 affects Sophos Unified Threat Management. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-25273?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-25273 published?: CVE-2021-25273 was published on 2021-07-29 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:sophos:unified_threat_management:*:*:*:*:*:*:*:*

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