Quick answers
- Is CVE-2023-24035 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2023-24035 being exploited in the wild.
- How severe is CVE-2023-24035?
- Low severity, with a CVSS score of 3.5, published 14 September 2026.
- Which products and versions are affected?
- Nagios XI before 5.9.3.
- Is there a fix for CVE-2023-24035?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2023-24035 attacked?
- It is attacked over the network.
- Am I affected by CVE-2023-24035?
- Check whether you run Nagios XI at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
The vulnerability exists in the is_insecure_login_authenticated function, which uses insecure timing comparison to validate credentials. This timing attack allows an attacker to bruteforce the admin password by measuring response time differences—correct password characters take slightly longer to compare than incorrect ones, leaking information character-by-character. The attack is network-reachable and requires no prior authentication. Patches are available in Nagios XI 5.9.3 and later.
Affected products
- Nagios XI before 5.9.3
Timeline
- 2026-09-14: disclosed