CVE-2020-15069
CriticalExploitedPublic exploitSophos 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.
Published Jun 29, 2020 · Updated Nov 7, 2025
Key Facts
Patch immediately- CVE-2020-15069 is a critical-severity vulnerability (CVSS 9.8 v3.1) affecting Xg Firewall Firmware (Sophos).
- It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Oct 31, 2024. Public exploit code is available.
- EPSS estimates a 11% probability of exploitation in the next 30 days.
- Fixed versions are available, including Xg Firewall Firmware 17.5.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v3.1
9.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
11%
Higher than 95.7% of all scored CVEs
Exploited in the wild
Yes
4 catalog listings
Public exploit code
Available
Proof-of-concept or weaponized module
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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.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| CISA KEV | Feb 6, 2025 | Feb 27, 2025 | Not reported |
| Industry KEV feed | Oct 31, 2024 | Feb 27, 2025 | Not reported |
| CIRCL KEV | Feb 6, 2025 | Feb 27, 2025 | Not reported |
| ENISA EUVD | Feb 6, 2025 | n/a | Not reported |
Required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Affected Products
13 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| Xg Firewall FirmwareSophos | 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 |
Patched Releases
Xg Firewall Firmware
17.5
Timeline
Publicly disclosed
Jun 29, 2020
Added to Industry KEV feed
Oct 31, 2024
Added to CISA KEV
Feb 6, 2025
Added to CIRCL KEV
Feb 6, 2025
Added to ENISA EUVD
Feb 6, 2025
Last updated
Nov 7, 2025
Weakness Type
- CWE-120 Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
References
- advisoryhttps://community.sophos.com/b/security-blog/posts/advisory-buffer-overflow-vulnerability-in-user-portal
- exploitVulnCheck exploitation report
- exploitVulnCheck exploitation report
- exploitVulnCheck exploitation report
- exploitVulnCheck exploitation report
FAQ
Common Questions.
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.
Affected: Xg Firewall Firmware (Sophos) versions 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. The full list is in the CVE brief.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Oct 31, 2024.
Yes. It was added on Feb 6, 2025 with a federal remediation due date of Feb 27, 2025.
Public exploit code is available.
Fixed versions are available, including Xg Firewall Firmware 17.5.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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