---
title: "CVE-2020-15069: Sophos XG Firewall Buffer Overflow Vulnerability"
url: https://erroneo.us/security/cve/CVE-2020-15069/
description: "CVE-2020-15069 (Sophos XG Firewall): Exploited in the wild (CISA KEV). Sophos XG Firewall 17.x through v17.5 MR12 allows a Buffer Overflow and remote code…"
type: vulnerability-record
section: "Security Digest"
date_published: 2020-06-29
date_modified: 2025-10-21
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2020-15069"
kev: true
cvss: 9.8
epss: 0.10674
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2020-15069: Sophos XG Firewall Buffer Overflow Vulnerability

**Signal:** Exploited: patch now if you run it. CISA has confirmed exploitation in the wild. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- Yes, if you run Sophos XG Firewall. CISA added this CVE to its Known Exploited Vulnerabilities catalog on 2025-02-06, which means there is reliable evidence of exploitation in the wild. US federal agencies must remediate by 2025-02-27 ; treat that as the outer limit, not the target.
- EPSS 10.7% , percentile 96: FIRST’s model estimates a 10.7% chance of exploitation activity in the next 30 days, higher than 96% of all scored CVEs (very high). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.

## What it is

Sophos XG Firewall 17.x through v17.5 MR12 allows a Buffer Overflow and remote code execution via the HTTP/S Bookmarks feature for clientless access. Hotfix HF062020.1 was published for all firewalls running v17.x.

## Affected products (CVE record)

- n/a n/a: see advisory

## Severity

- CISA-ADP CVSS 3.1: 9.8 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`

## Exploitation

- CISA KEV: added 2025-02-06; federal due date 2025-02-27. Known ransomware use: Unknown.
- CISA required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
- CISA SSVC assessment: exploitation active , automatable yes , technical impact total .
- FIRST EPSS (model of 2026-10-21): 10.67% probability of exploitation activity in the next 30 days; percentile 96.

## Sources

- [Listed in CISA KEV notes (community.sophos.com)](https://community.sophos.com/b/security-blog/posts/advisory-buffer-overflow-vulnerability-in-user-portal)
- [CVE.org record CVE-2020-15069](https://www.cve.org/CVERecord?id=CVE-2020-15069)
- [NVD entry CVE-2020-15069](https://nvd.nist.gov/vuln/detail/CVE-2020-15069)
- [CISA Known Exploited Vulnerabilities catalog entry](https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-15069)

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Source page: https://erroneo.us/security/cve/CVE-2020-15069/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt