CVE-2018-13457
qh_echo in Nagios Core 4.4.1 and earlier is prone to a NULL pointer dereference vulnerability, which allows attackers to cause a local denial-of-service condition by sending a crafted payload to the listening UNIX socket.
Does this matter?
A public exploit is published in Exploit-DB, so the technical barrier is gone even though the severity is medium and EPSS is 4.5%. Treat it as high on anything reachable from the internet.
Description
qh_echo in Nagios Core 4.4.1 and earlier is prone to a NULL pointer dereference vulnerability, which allows attackers to cause a local denial-of-service condition by sending a crafted payload to the listening UNIX socket.
- CVSS 3.0
- 5.5 MEDIUMCVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
- EPSS
- 4.45% probability · 91th percentile
- Public exploits
- 1 in Exploit-DB · first 24 July 2018
- CISA KEV
- Not listed
- Weakness
- CWE-476
- Affected
- nagios/nagios core
- Source
- cve@mitre.org
EPSS moved from 7.3% on 21 September 2026 to 4.5% on 27 October 2026. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”.
Public exploits (1)
Entries in Exploit-DB that cite this CVE. Links go to the Exploit-DB page and to the file in the public repository; nothing is hosted here. A verified tick means the Exploit-DB team confirmed the exploit works against the stated version.
References
- http://lists.opensuse.org/opensuse-security-announce/2020-04/msg00014.html
- http://lists.opensuse.org/opensuse-security-announce/2020-04/msg00022.html
- https://gist.github.com/fakhrizulkifli/87cf1c1ad403b4d40a86d90c9c9bf7abExploit, Third Party Advisory
- https://knowledge.opsview.com/v5.3/docs/whats-newThird Party Advisory
- https://knowledge.opsview.com/v5.4/docs/whats-newThird Party Advisory
- https://www.exploit-db.com/exploits/45082/Exploit, Third Party Advisory, VDB Entry
- http://lists.opensuse.org/opensuse-security-announce/2020-04/msg00014.html
- http://lists.opensuse.org/opensuse-security-announce/2020-04/msg00022.html
- https://gist.github.com/fakhrizulkifli/87cf1c1ad403b4d40a86d90c9c9bf7abExploit, Third Party Advisory
- https://knowledge.opsview.com/v5.3/docs/whats-newThird Party Advisory
- https://knowledge.opsview.com/v5.4/docs/whats-newThird Party Advisory
- https://www.exploit-db.com/exploits/45082/Exploit, Third Party Advisory, VDB Entry
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.