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CVE-2020-15069

72
FAUCET Score

CVE-2020-15069 is a critical buffer overflow vulnerability affecting Sophos XG Firewall versions 17.x through v17.5 MR12, specifically within the HTTP/S Bookmarks feature for clientless access. This vulnerability carries a CVSS score of 9.8, indicating a critical risk due to its network-based attack vector, low attack complexity, and potential for complete compromise of confidentiality, integrity, and availability. It is actively exploited in the wild, as confirmed by its presence in the KEV catalog, though public exploit code like Metasploit or ExploitDB entries are not available. Sophos released hotfix HF062020.1 to address this issue.

Impacted Technologies

VendorProductVersion(s)CPE
>= 17.0, < 17.5CPE matchmatch criteria
cpe:2.3:o:sophos:xg_firewall_firmware:*:*:*:*:*:*:*:*
17.5CPE matchmatch criteria
cpe:2.3:o:sophos:xg_firewall_firmware:17.5:-:*:*:*:*:*:*
17.5CPE matchmatch criteria
cpe:2.3:o:sophos:xg_firewall_firmware:17.5:maintenance_release1:*:*:*:*:*:*
17.5CPE matchmatch criteria
cpe:2.3:o:sophos:xg_firewall_firmware:17.5:maintenance_release10:*:*:*:*:*:*
17.5CPE matchmatch criteria
cpe:2.3:o:sophos:xg_firewall_firmware:17.5:maintenance_release11:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

9.8CRITICAL

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
10.67%
Probability of exploitation in next 30 days
EPSS Percentile
95.3%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
Added to KEV · Feb 6, 2025
This CVE's current EPSS score of 0.1067 is in the 91st percentile among its peer group of 36,862 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

cisa.gov / known-exploited-vulnerabilities-catalog
US Government Resource
community.sophos.com / b/security-blog/posts/advisory-buffer-overflow-vulnerability-in-user-portal
MitigationVendor Advisory