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Fencer Vulns
high 7.5

CVE-2023-29552 kev in the critical feed json

The Service Location Protocol (SLP, RFC 2608) allows an unauthenticated, remote attacker to register arbitrary services.

published 2023-04-25 3 y ago modified 2026-06-17 4 mo ago also EUVD-2023-33094

cvss
7.5
version 3.1, CNA
cisa kev
Exploited
added 2023-11-08
epss
64.0%
EPSS 64.0% chance of exploitation in 30 days, percentile 99.2%
public exploits
0
none known

Summary

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.

Patch / fix

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.

  • vmware esxi 7.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2023-29552 updated cvss 7.5

openslp: Reflective denial of service amplification attack via UDP

  • Red Hat Enterprise Linux 6 openslp, openslp-server
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 7 openslp, openslp-server Red Hat Enterprise Linux 9 openslp, openslp-server
    affected: no fix planned “Will not fix”
  • Red Hat Enterprise Linux 8 openslp
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Timeline

  1. Published
  2. Added to CISA KEV
  3. CISA patch deadline
  4. CISA SSVC: exploitation active

Known exploited

Added
3 y ago
Patch by
2023-11-29 (2 y ago)
Ransomware
Not known
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.
Vendor, product
IETF, Service Location Protocol (SLP)
CISA name
Service Location Protocol (SLP) Denial-of-Service Vulnerability

CISA SSVC

Exploitation
Active, exploited in the wild
Automatable
yes
Technical impact
partial
Assessed
21 mo ago

Exploit prediction

63.98% chance of exploitation in the next 30 days, higher than 99.2% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • bitsight.com https://www.bitsight.com/blog/new-high-severity-vulnerability-cve-2023-29552-discovered-service-location-protocol-slp referenced PoC, tagged "exploit" by a source, unverified
  • curesec.com https://curesec.com/blog/article/CVE-2023-29552-Service-Location-Protocol-Denial-of-Service-Amplification-Attack-212.html referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CISA ADP 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Classification

Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.