Threats / Sophos / CVE-2020-15069
CVE-2020-15069
· EUVD no mirror located
· GCVE no mirror located
Verified 2026-06-22
Sophos XG Firewall vulnerability
Sophos XG Firewall contains a buffer overflow in the HTTP/S bookmark feature allowing remote code execution. The vulnerability is actively exploited in the wild.
Verdict
Today item — known-exploited.
A remote attacker can exploit a buffer overflow in the bookmark processing functionality to execute arbitrary code on affected Sophos XG Firewall appliances without authentication, leading to complete system compromise.
01
Is it exploitable?
— the evidence, ranked above the scoreReported exploitation
6 independent public reports of in-the-wild exploitation are cataloged.Distinct reporting sources (vendor, incident response, government); open them for the underlying claims.
Exploited in the wild
Listed in the CISA Known Exploited Vulnerabilities catalog (added 2025-02-06).
Probability (EPSS)
EPSS 0.10674 — modeled likelihood of exploitation activity.EPSS is a daily-changing model output — open the source for today's value.
Severity / affected
Affected: Sophos, XG Firewall. Confirm exact fixed builds in the vendor advisory.
Weakness (CWE)
Mapped to CWE-120 Buffer Copy without Size Check — weakness family: Memory safety.CWE assignment from the public NVD record; the weakness class drives how the flaw is exploited.
02
Who’s exploiting it?
— attribution turns risk into urgencyAttribution not established
No confirmed (advisory-backed) threat-actor attribution is established for this record. Absence of a named actor is not absence of compromise — see Coverage & confidence.
03
Why it matters
— the attack path, told twice: adversary, then board1
Front door — unauthenticated access narrative 1
Attacker
I craft a malicious HTTP/S bookmark request that overflows a fixed-size buffer in the firewall's bookmark handler.
Business
The firewall's core security functions are bypassed, exposing the organization's network perimeter to direct compromise.
2
Keys to the kingdom — privilege/identity takeover narrative 2
Attacker
I inject shellcode into the overflowed buffer to gain code execution with firewall privileges.
Business
Attackers obtain persistent administrative access to the security appliance, enabling lateral movement into protected networks.
3
Lateral reach — past segmentation narrative 3
Attacker
I use the compromised firewall to intercept, modify, or exfiltrate network traffic passing through it.
Business
Sensitive data and communications are exposed; the organization loses trust in its perimeter security controls.
04
What to do
— defensible action- Remediate per the vendor advisory — confirm the fixed build for your version and verify exposure.1
Say it to the boardA vulnerability with this evidence profile is a defensible budget line, not a backlog ticket — fund the change against the proof above.
05