---
title: "CVE-2023-29552: Service Location Protocol (SLP) Denial-of-Service Vulnerability"
url: https://erroneo.us/security/cve/CVE-2023-29552/
description: "CVE-2023-29552 (IETF Service Location Protocol (SLP)): Exploited in the wild (CISA KEV). The Service Location Protocol (SLP, RFC 2608) allows an…"
type: vulnerability-record
section: "Security Digest"
date_published: 2023-04-25
date_modified: 2025-10-21
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2023-29552"
kev: true
cvss: 7.5
epss: 0.63975
license: All rights reserved. Quote with attribution and a link.
---

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

**Signal:** Exploited: patch now if you run it. CISA has confirmed exploitation in the wild. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- Yes, if you run IETF Service Location Protocol (SLP). CISA added this CVE to its Known Exploited Vulnerabilities catalog on 2023-11-08, which means there is reliable evidence of exploitation in the wild. US federal agencies must remediate by 2023-11-29 ; treat that as the outer limit, not the target.
- EPSS 64.0% , percentile 99: FIRST’s model estimates a 64.0% chance of exploitation activity in the next 30 days, higher than 99% of all scored CVEs (very high). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.

## What it is

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.

## Affected products (CVE record)

- n/a n/a: see advisory

## Severity

- CISA-ADP CVSS 3.1: 7.5 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`

## Exploitation

- CISA KEV: added 2023-11-08; federal due date 2023-11-29. Known ransomware use: Unknown.
- 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.
- CISA SSVC assessment: exploitation active , automatable yes , technical impact partial .
- FIRST EPSS (model of 2026-10-21): 63.98% probability of exploitation activity in the next 30 days; percentile 99.

## Sources

- [Listed in CISA KEV notes (bitsight.com)](https://www.bitsight.com/blog/new-high-severity-vulnerability-cve-2023-29552-discovered-service-location-protocol-slp)
- [CVE.org record CVE-2023-29552](https://www.cve.org/CVERecord?id=CVE-2023-29552)
- [NVD entry CVE-2023-29552](https://nvd.nist.gov/vuln/detail/CVE-2023-29552)
- [CISA Known Exploited Vulnerabilities catalog entry](https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-29552)
- [Listed in CISA KEV notes (cisa.gov)](https://www.cisa.gov/news-events/alerts/2023/04/25/abuse-service-location-protocol-may-lead-dos-attacks)
- [datatracker.ietf.org](https://datatracker.ietf.org/doc/html/rfc2608)
- [blogs.vmware.com](https://blogs.vmware.com/security/2023/04/vmware-response-to-cve-2023-29552-reflective-denial-of-service-dos-amplification-vulnerability-in-slp.html)
- [suse.com](https://www.suse.com/support/kb/doc/?id=000021051)
- [curesec.com](https://curesec.com/blog/article/CVE-2023-29552-Service-Location-Protocol-Denial-of-Service-Amplification-Attack-212.html)
- [github.com](https://github.com/curesec/slpload)
- [security.netapp.com](https://security.netapp.com/advisory/ntap-20230426-0001/)

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Source page: https://erroneo.us/security/cve/CVE-2023-29552/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt