CVE-2023-29552
Published: November 8, 2023
Official Description
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 KEV Advisory
Service Location Protocol (SLP) Denial-of-Service Vulnerability
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.
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.
Risk Analysis
The Service Location Protocol (SLP) is vulnerable to a denial-of-service (DoS) attack, allowing an unauthenticated, remote attacker to register services and use spoofed UDP traffic for a DoS attack with significant amplification. The high EPSS score of 0.92962 indicates a very high likelihood of exploitation, making this a critical concern for systems using SLP.
This vulnerability is actively exploited in the wild and is included in CISA's KEV catalog, confirming its use by threat actors. The remote and unauthenticated nature of the attack vector makes it highly dangerous.
Administrators should disable SLP if it is not essential for network operations. If SLP is required, ensure it is properly secured and consider implementing network filtering to restrict access to SLP ports.
Technical Analysis
CVE-2023-29552 requires local access, meaning attackers must already have a foothold on the target system.
Exploitation requires some privileges, which limits the exposure to scenarios where an attacker has already gained initial access.
CISA has added CVE-2023-29552 to the Known Exploited Vulnerabilities (KEV) catalog, confirming active exploitation in the wild. U.S. federal agencies are required to patch this within the mandated timeframe, and all organizations should treat remediation as urgent.
Exploit & PoC Resources
All References (1)
Quick Facts
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2023-29552 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts
- !CISA KEV: Federal agencies must patch per BOD 22-01 timeline
- !Active exploitation confirmed — treat as P1