CVE-2023-52557 OpenBSD 7.3 invalid l2tp message npppd crash
A remote attacker can crash the npppd daemon in OpenBSD by sending a malformed L2TP message with an invalid AVP length.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2023-52557?
CVE-2023-52557 is a high-severity denial of service vulnerability in Openbsd Openbsd, published on 1 Mar 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
In OpenBSD 7.3 before errata 016, npppd(8) could crash by a l2tp message which has an AVP (Attribute-Value Pair) with wrong length.
Which versions are affected by CVE-2023-52557?
It affects 1 product.
Products include Openbsd Openbsd.
How do I fix CVE-2023-52557?
No fix has been published for CVE-2023-52557 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2023-52557 being exploited?
There is no known exploitation of CVE-2023-52557 in the wild and no public exploit code.
Other vulnerabilities in Openbsd Openbsd
Sources
Also known as GHSA-fr6m-422w-fv5h.