vulnerability

CVE-2020-15069

9.8

Critical

KEV · Exploited in wildEPSS 11%Patch available

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.

exploited

Yes, in CISA KEV since 6 Feb 2025fix by 27 Feb 2025 (CISA deadline for US federal agencies)

fix

Patch available see the advisory in the references

likelihood

EPSS 10.7%

Published 29 Jun 2020Analysed here 2 Nov 2026CVSS scored by CISA

do firstApply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

triage

server-sideruntimeWAF can block: noAV · networkCWE-120· Buffer Overflow

Can a WAF block it? No. This is a buffer overflow. Generic WAF rules do not recognise the input that triggers it; only a rule written for this specific CVE can, and only if the triggering request has a recognisable shape.

Also consider: patch

Based on the weakness type only; no CVE-specific evidence yet. We check Cloudflare, AWS, Google Cloud Armor and Azure; for Akamai, Imperva, Fastly, F5, ask your vendor.

cvss vector

attack vectornetworkattack complexitylowprivileges requirednoneuser interactionnonescopeunchangedconfidentialityhighintegrityhighavailabilityhigh

CVSS 3.1 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

common questions

Is CVE-2020-15069 being exploited?

Yes. CVE-2020-15069 appears in CISA's Known Exploited Vulnerabilities catalog, which means exploitation in the wild has been confirmed and reported. Treat it as active rather than theoretical, and patch it ahead of higher-scoring vulnerabilities that carry no exploitation evidence.

How severe is CVE-2020-15069?

CVE-2020-15069 is rated Critical with a CVSS score of 9.8. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.

Is there a patch for CVE-2020-15069?

Yes. A fix has been recorded for CVE-2020-15069. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.

What does CVE-2020-15069 affect?

CVE-2020-15069 affects sophos:xg_firewall_firmware. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.

Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.

executive summary

technical analysis

affected

sophos:xg_firewall_firmware

cisa ssvc

exploitation: active
automatable: yes
technical impact: total

Assessed by CISA 7 Feb 2025 (SSVC 2.0.3).

timeline

29 Jun 2020Published
6 Feb 2025Added to CISA KEV (exploited in the wild) · 1,682 days (about 5 years) later
7 Feb 2025CISA SSVC assessment: exploitation active · 1 day later
27 Feb 2025CISA remediation due date (US federal agencies) · 20 days later
21 Oct 2025CVE record last updated · 237 days (about 8 months) later
2 Nov 2026Analysed by vulneraibility.com · 377 days (about 1 year) later

how to fix

Remediation steps are tailored for users whose stack is affected. Add this technology to your stack to see the fix checklist.

references

NVD CVE.org CVE Details Source

2 references in the CVE record: 2 links

Linkcommunity.sophos.com /b/security-blog/posts/advisory-buffer-overflow-vulnerability-in-user-portal
Linkcisa.gov /known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-15069

sources

CVE List (CVE.org): description, affected versions, references; CVE Terms of Use
NVD: CVSS and CPE data
CISA KEV catalog: exploitation, date added, due date
CISA Vulnrichment (ADP): SSVC decision points
FIRST EPSS: exploit probability and percentile
Summary, impact and triage tags: written by our AI analysis pipeline from the sources above. Check them against the sources.

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