Known exploited · Veeam

CVE-2022-26500: Veeam Backup & Replication Remote Code Execution Vulnerability

What it is

The Veeam Distribution Service in the Backup & Replication application allows unauthenticated users to access internal API functions. A remote attacker can send input to the internal API which may lead to uploading and executing of malicious code.

Added December 13, 2022Due January 3, 2023CISA KEV catalog 2026.10.01

Vendor: Veeam
Product: Backup & Replication
Added to KEV: December 13, 2022
CISA due date: January 3, 2023
Ransomware use: Known
Weakness: CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

What CISA requires

Apply updates per vendor instructions.

Forensic triage

What to do now

Find every instance of Backup & Replication you run, including the forgotten ones, and check its version against the vendor advisory.
Apply the vendor's fix or mitigation, before January 3, 2023 if you are bound by CISA's deadline, sooner if it faces the internet.
Assume it was tried against you already: look for signs of exploitation from the date it was added, not from the day you patched.
Until every instance is patched, block the attack at the edge: a WAF in blocking mode stops path traversal attempts.

References

CVE-2022-26500 in the National Vulnerability Database

The Dome

Block it at the edge while you patch

The Dome's WAF runs the OWASP Core Rule Set in blocking mode and stops path traversal attempts before they reach your application.

See the Dome

T Academy

Train the engineers who fix it

Security engineering on real hosts in the browser, every objective checked on the machine. The first two lessons of Linux 1 are free.

Start free

Source: CISA Known Exploited Vulnerabilities Catalog (public domain), catalog version 2026.10.01.