CVE-2023-29552
7.5, high Known exploitedService Location Protocol (SLP) Denial-of-Service Vulnerability
- CVSS
- 7.5, high high CVSS v3.1
- EPSS, next 30 days
- 64% higher than 99.2% of scored CVEs
- Exploitation
- Confirmed in the wild
- Published
- 25 Apr 20233 years ago
Known exploited
CISA added this to the Known Exploited Vulnerabilities Catalog on 8 Nov 2023. US federal agencies had to remediate by 29 Nov 2023, a deadline that has passed.
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.
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.
Details
- Vendor
- IETF and 3 more
- Product
- Smi-s Provider
- Weakness
- n/a
- Status
- Analyzed
- Updated
- 17 Jun 2026
- Assigner
- cve@mitre.org
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
References 9
Exploit code 2
Advisories 4
- blogs.vmware.com /security/2023/04/vmware-response-to-cve-2023-29552-reflective-denial-of-service-dos-amplification-vulnerability-in-slp.html (opens in a new tab)
- security.netapp.com /advisory/ntap-20230426-0001/ (opens in a new tab)
- cisa.gov /news-events/alerts/2023/04/25/abuse-service-location-protocol-may-lead-dos-attacks (opens in a new tab)
- suse.com /support/kb/doc/?id=000021051 (opens in a new tab)
The kind is read from NVD's tags where present and from the shape of the URL otherwise, so treat it as a hint.
Other IETF CVEs
Every IETF CVE we holdSame vendor in what we hold, not a known link between the flaws.
- CVE-2023-44487 HTTP/2 Rapid Reset Attack Vulnerability KEV EPSS 100% 7.5, high
Beyond this page
Is CVE-2023-29552 in your network?
This page tells you how dangerous CVE-2023-29552 is out there. Whether it sits on one of your devices, only a scan of your own network can tell. That is what our systems do, every day, for the companies we protect.
CVE-2023-29552 is in the CISA catalogue of exploited vulnerabilities: attackers are already exploiting it.
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EXYS7600 OCELOT
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EXYS7950 KONDRA
Detect it if it's exploited
Until the patch is applied, Kondra monitors your network, events and endpoints in real time. It keeps an inventory of the software installed on every endpoint, and its anomaly detection rules flag what an attacker does once inside.
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Assembled from the NVD 2.0 API, the CISA Known Exploited Vulnerabilities Catalog and FIRST EPSS. Scores are as of our last collection on 17 Oct 2026, not the live upstream state.