CVE-2023-29552: in the CISA KEV catalogue
Service Location Protocol (SLP) Denial-of-Service Vulnerability. CISA added CVE-2023-29552 to the Known Exploited Vulnerabilities catalogue on 2023-11-08 with a default due date of 2023-11-29. Known ransomware campaign use: Unknown. Forensic triage flag: No.
The Service Location Protocol (SLP) contains a denial-of-service (DoS) vulnerability that could allow an unauthenticated, remote attacker to register services and use spoofed UDP traffic to conduct a denial-of-service (DoS) attack with a significant amplification factor. (CISA description)
- Vendor / product
- IETF Service Location Protocol (SLP)
- CWE
- Not listed
- CISA required action
- Apply mitigations per vendor instructions or disable SLP service or port 427/UDP on all systems running on untrusted networks, including those directly connected to the Internet.
- EPSS
- 64%, percentile 99 (scored 2026-11-03)
EPSS puts about 64 in 100 odds (64%) on exploitation activity being observed in the next 30 days. Its score is higher than or equal to that of 99% of scored CVEs. This is a model estimate about exploitation anywhere, not about your environment.
Vendor and reference links (from CISA)
Your own deadline under CISA BOD 26-04 depends on exposure, automatability and technical impact: work it out with the BOD 26-04 calculator.
Frequently asked questions
Is CVE-2023-29552 in the CISA KEV catalogue?
Yes. CISA added CVE-2023-29552 (Service Location Protocol (SLP) Denial-of-Service Vulnerability) to the Known Exploited Vulnerabilities catalogue on 2023-11-08. CISA's default due date for it is 2023-11-29.
Is CVE-2023-29552 used in ransomware attacks?
CISA marks known ransomware campaign use as Unknown for CVE-2023-29552. That means CISA lacks confirmation, not that ransomware groups do not use it.
What should I do about CVE-2023-29552?
CISA's required action: Apply mitigations per vendor instructions or disable SLP service or port 427/UDP on all systems running on untrusted networks, including those directly connected to the Internet.
Sources
- CISA, Known Exploited Vulnerabilities Catalog (accessed 2026-11-03)
- FIRST, Exploit Prediction Scoring System (EPSS) (EPSS by FIRST; scores generated by Empirical Security)
- NVD record for CVE-2023-29552