9.8

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

CVSS: 9.8v3.1CriticalKEVAnalyzed
Published 29-06-2020Last modified 21-10-2025
Open JSON

Vulnerability summary

CVE-2020-15069 is a critical (CVSS 9.8) Classic Buffer Overflow vulnerability in Sophos XG Firewall. It is known to be exploited: CISA lists it, first on 06-02-2025. EPSS estimates a 10.67% chance of exploitation in the next 30 days, higher than 95.7% of scored vulnerabilities.

Overall risk
85/100
0100
Critical · default modelHow is this calculated?
CVSS score
9.8/10
010
Critical · v3.1 (CVE.org)
EPSS score
10.67%
0%100%
Medium · 0.00 pp in 30 days
KEVListedCISA
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 29-06-2020
    PublishedVulnerability first disclosed.
  2. 06-02-2025
    Added to CISA KEVSophos XG Firewall Buffer Overflow Vulnerability
  3. 27-02-2025
    CISA remediation dueApply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
  4. 21-10-2025
    Last modifiedVulnerability information updated.

Description

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.

CVSS metrics

3 scores · 2 sources · 2 versions

EPSS trend

Probability

10.67%

Chance of exploitation in the next 30 days

Percentile

96%

Versus all other CVEs

30-day change

0.00 pp

From 10.67% on 20-09-2026

20-09-202620-10-2026
EPSS score
10.67%

Known exploited

Compare KEV catalogs
CISA KEVListed
Added
06-02-2025
Federal due date
27-02-2025

CISA required action

Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable. community.sophos.com/b/security-blog/posts/advisory-buffer-overflow-vulnerability-in-user-portal nvd.nist.gov/vuln/detail/CVE-2020-15069

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Sophos1 product
  • xg_firewall_firmware17.5:maintenance_release9 | ≥ 17.0, < 17.5 | 17.5 | 17.5:maintenance_release1 | 17.5:maintenance_release10 | 17.5:maintenance_release11 | 17.5:maintenance_release12 | 17.5:maintenance_release3 | 17.5:maintenance_release4 | 17.5:maintenance_release5 | 17.5:maintenance_release6 | 17.5:maintenance_release7 | 17.5:maintenance_release8

1 vendor · 1 product

References

2 links