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Security Digest · Vulnerability record · Known exploited

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

Exploited in the wild (CISA KEV). The Service Location Protocol (SLP, RFC 2608) allows an unauthenticated, remote attacker to register arbitrary services.

CISA KEV · added 2023-11-08 CVSS 7.5 High EPSS 64.0% · p99

Updated By erroneo.us Security Desk11 references Seen in the digest for Nov 8, 2023

Should you act?

Exploited: patch now if you run it

CISA has confirmed exploitation in the wild. This signal is computed from CISA KEV, EPSS and CVSS data; it is not an editorial verdict.

  • 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.

CISA’s summary

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.

Product: IETF Service Location Protocol (SLP) · Assigned by: mitre · Published: 2023-04-25

Affected and fixed versions

VendorProductAffected versions (per CVE record)
n/an/asee vendor advisory

Severity scores

Scored byCVSSScoreVector
CISA-ADP3.17.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
  • Attack vector: network (remotely reachable)
  • Attack complexity: low
  • Privileges required: none (no login)
  • User interaction: none
  • Scope: unchanged

CVSS measures how bad a flaw is if exploited, not how likely exploitation is. Read it next to the exploitation data below.

Exploitation and urgency

  • 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.

Timeline

  • — CVE record published by mitre
  • — Added to CISA’s Known Exploited Vulnerabilities catalog
  • — CISA remediation deadline for US federal agencies
  • — CVE record last updated

Sources and references

Original sources first. Version and fix details should always be confirmed against the vendor or project advisory.

Vendor and project advisories, patches

  1. Listed in CISA KEV notes (bitsight.com) bitsight.com

Vulnerability records

  1. CVE.org record CVE-2023-29552 cve.org
  2. NVD entry CVE-2023-29552 nvd.nist.gov

Government

  1. CISA Known Exploited Vulnerabilities catalog entry cisa.gov
  2. Listed in CISA KEV notes (cisa.gov) cisa.gov

Other references from the CVE record and advisory

  1. datatracker.ietf.org datatracker.ietf.org
  2. blogs.vmware.com blogs.vmware.com
  3. suse.com suse.com
  4. curesec.com curesec.com
  5. github.com github.com
  6. security.netapp.com security.netapp.com

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