CVE-2025-2833 zhangyd-c OneBlog HTTP Header redos
Remote attackers can cause denial of service in OneBlog by sending crafted X-Forwarded-For headers that trigger inefficient regular expression processing.
- 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-2025-2833?
CVE-2025-2833 is a medium-severity denial of service vulnerability in zhangyd-c OneBlog, published on 27 Mar 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A vulnerability was found in zhangyd-c OneBlog up to 2.3.9. It has been classified as problematic. Affected is an unknown function of the component HTTP Header Handler. The manipulation of the argument X-Forwarded-For leads to inefficient regular expression complexity. It is possible to launch the attack remotely. The exploit has been disclosed to the public and may be used.
Which versions are affected by CVE-2025-2833?
It affects 1 product.
Products include Zhyd Oneblog.
How do I fix CVE-2025-2833?
No fix has been published for CVE-2025-2833 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-2025-2833 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-2833 exists.
Other vulnerabilities in zhangyd-c OneBlog
Sources
Also known as GHSA-5jpq-rg6x-9vcr.