CVE-2023-29552: Service Location Protocol (SLP) Denial-of-Service Vulnerability

Required action (CISA's text)

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.

Description (NVD)

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.

SOURCES

• CISA KEVCISA Known Exploited Vulnerabilities catalog

Other IETF flaws

• CVE-2023-44487: HTTP/2 Rapid Reset Attack Vulnerability

Data from NVD, CISA KEV, FIRST EPSS and vendor advisories. Updated 10 Nov 2026.