CVE-2023-29552

HIGH

7.5

CVSS Score

Published: April 25, 2023 at 12:00 AM UTC

Updated: June 17, 2026 at 05:50 AM UTC

5 products affected across 4 vendorsLinux Enterprise ServerESXiManager Server

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Severity

HIGH7.5

Exploitation

CISA KEV

Exploit prediction

EPSS 64%

SSVC

Active

Actively Exploited

CISA Known Exploited Vulnerabilities (KEV) Catalog

EPSS Score64.0%

EPSS (Exploit Prediction Scoring System) estimates a 64.0% chance this CVE is exploited in the wild within the next 30 days — higher than 99% of all CVEs. It complements CVSS: a high EPSS on a mid-severity CVE can still be urgent.

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.

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.

Ransomware Use

Unknown

Added to KEV

Nov 8, 2023

Remediation Due

Nov 29, 2023

1062 days overdue

Notes

This vulnerability affects a common open-source component, third-party library, or a protocol used by different products. Please check with specific vendors for information on the patching status. For more information please see https://www.bitsight.com/blog/new-high-severity-vulnerability-cve-2023-29552-discovered-service-location-protocol-slp and https://www.cisa.gov/news-events/alerts/2023/04/25/abuse-service-location-protocol-may-lead-dos-attacks.

https://nvd.nist.gov/vuln/detail/CVE-2023-29552

Description

The Service Location Protocol (SLP, RFC 2608) allows an unauthenticated, remote attacker to register arbitrary services. This could allow the attacker to use spoofed UDP traffic to conduct a denial-of-service attack with a significant amplification factor.