CVE-2020-15069: Sophos XG Firewall Buffer Overflow Vulnerability
Advisory generated from the CVE record, CISA, Exploit Observer and VEDAS: what it is, whether it is exploited, who is affected, and how to fix and detect it.
Generated by VEDAS. Scores as of 2026-11-01 19:19 UTC. Rebuilt every few hours from cve-scores, CISA KEV and vedas-signatures. How this works and its limits.
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.
Description quoted from the CVE record (assigned by mitre, published 2020-06-29).
Weakness: CWE-120 Buffer Copy without Checking Size of Input (‘Classic Buffer Overflow’)
How it can be exploited
Exploitable over the network with low attack complexity needing no privileges and no user interaction. Impact: confidentiality high, integrity high, availability high. CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CISA assessment (SSVC): CISA assesses exploitation as active. Automatable: yes. Technical impact: total.
- On CISA KEV since
- 2025-02-06
- US federal deadline
- 2025-02-27
- Ransomware use
- Not known
Public exploit evidence (Exploit Observer)
Also known as: CNNVD-202006-1825, EUVD-2020-7197, GHSA-x7vj-wqq4-cq4v
Exploit Observer has no public exploit code that names this CVE or one of its aliases.
Vulnerability databases and vendor advisories (5)
Catalogue entries, not exploit evidence.
- Vulnerability database or vendor advisory: https://euvd.enisa.europa.eu/enisa/EUVD-2020-7197
- Vulnerability database or vendor advisory: https://github.com/advisories/GHSA-x7vj-wqq4-cq4v
- Vulnerability database or vendor advisory: https://nvd.nist.gov/vuln/detail/CVE-2020-15069
- Vulnerability database or vendor advisory: https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-15069
- Vulnerability database or vendor advisory: https://www.cnnvd.org.cn/home/globalSearch?keyword=CNNVD-202006-1825
11 more references returned by Exploit Observer did not name this CVE or an alias, so they are left out.
VEDAS data as of 2026-11-01T17:12 UTC; fetched 2026-11-02.
Live scores
- EPSS
- 0.107
likely to be attacked soon - VEDAS
- 0.705
some exploit evidence - On CISA KEV
- Yes, since 2025-02-06
- Detection rule
- None yet
Thin horizontal line: the “likely” (EPSS 0.10) or “strong” (VEDAS 0.90) threshold. Shaded “no data” areas are periods when cve-scores did not publish.
Who is affected
| Product | Affected | Not affected |
|---|---|---|
| Not stated | version n/a | Not stated |
Version ranges exactly as the CVE record states them. “Before X” means X is the first fixed version.
How to fix it
CISA required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Vendor guidance:
- https://community.sophos.com/b/security-blog/posts/advisory-buffer-overflow-vulnerability-in-user-portal
- https://nvd.nist.gov/vuln/detail/CVE-2020-15069
How to detect it
There is no open VEDAS detection rule for this bug yet. It is listed on the detection gaps page if CISA has confirmed attacks.
References
Government sources
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-15069 (government-resource)
Other references
- https://community.sophos.com/b/security-blog/posts/advisory-buffer-overflow-vulnerability-in-user-portal (x_refsource_CONFIRM)
Other databases
Where this comes from
This advisory is generated automatically by VEDAS from: CVE.org record, CISA KEV, cve-scores (EPSS and VEDAS), Exploit Observer. Text in quotes is reproduced from the source; everything else is a fixed template filled with source fields. Nothing here is written by a language model. Check the vendor advisory before acting, and read how VEDAS and Exploit Observer work, and their limits.