CVE-2021-25268Network attack vector

Administrator escalation via Webadmin cross-site scripting

Published May 5, 2022 · Updated Aug 3, 2024

Cross-site scripting in Webadmin in Sophos Firewall before 19.0 GA allows remote authenticated users to escalate from MySophos admin to SFOS admin. Sophos has not published the affected Webadmin parameters or the input-handling error that permits script injection. Exploitation requires MySophos administrator privileges and victim interaction; successful script execution grants SFOS administrative authority.

CVSS severity8.4
High
EPSS probability0.90%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site scripting in Webadmin in Sophos Firewall before 19.0 GA allows remote authenticated users to escalate from MySophos admin to SFOS admin. Sophos has not published the affected Webadmin parameters or the input-handling error that permits script injection. Exploitation requires MySophos administrator privileges and victim interaction; successful script execution grants SFOS administrative authority.

The record

CVE
CVE-2021-25268
Published
May 5, 2022
Updated
Aug 3, 2024
Vendor
Sophos
Product
Sophos Firewall
Classifications
CWE-79, T1068
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. May 5, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=unspecified <19.0 GA

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Sophos · Sophos Firewallversion=unspecified <19.0 GA

Published CVSS scores

6.0NIST NVDAV:N/AC:M/Au:S/C:P/I:P/A:P
8.4Sophos LimitedCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1068Exploitation for Privilege Escalation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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