CVE-2025-67901 Null dereference in openrsync
A remote attacker can crash the openrsync server by sending a zero-length block data request, causing a segmentation fault.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-67901?
CVE-2025-67901 is a medium-severity vulnerability in kristapsdz openrsync, published on 14 Dec 2025. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
openrsync through 0.5.0, as used in OpenBSD through 7.8 and on other platforms, allows a client to cause a server SIGSEGV by specifying a length of zero for block data, because the relationship between p->rem and p->len is not checked.
Weakness: CWE-1284
Which versions are affected by CVE-2025-67901?
How do I fix CVE-2025-67901?
No fix has been published for CVE-2025-67901 yet. Limit exposure of the affected software until one is available.
Is CVE-2025-67901 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-67901 exists.
Sources
Also known as GHSA-cwrr-xmm2-f4jr.