6.5

CVE-2023-42670: Samba: ad dc busy rpc multiple listener dos

Modified
AliasesALPINE-CVE-2023-42670UBUNTU-CVE-2023-42670DEBIAN-CVE-2023-42670
Published 03-11-2023Last modified 20-11-2025

Vulnerability summary

CVE-2023-42670 is a medium (CVSS 6.5) Uncontrolled Resource Consumption vulnerability in fedoraproject fedora. EPSS estimates a 1.32% chance of exploitation in the next 30 days, higher than 70.8% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 6.5, network access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
6.5/10
010
Medium · v3.1 (CVE.org)
EPSS score
1.32%
0%100%
Low · +0.21 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 4 · Related 4
DSA-5525-1OPENSUSE-SU-2024:13332-1SUSE-SU-2023:4046-1USN-6425-1USN-6425-3

Timeline

  1. 03-11-2023
    PublishedVulnerability first disclosed.
  2. 20-11-2025
    Last modifiedVulnerability information updated.

Description

A flaw was found in Samba. It is susceptible to a vulnerability where multiple incompatible RPC listeners can be initiated, causing disruptions in the AD DC service. When Samba's RPC server experiences a high load or unresponsiveness, servers intended for non-AD DC purposes (for example, NT4-emulation "classic DCs") can erroneously start and compete for the same unix domain sockets. This issue leads to partial query responses from the AD DC, causing issues such as "The procedure number is out of range" when using tools like Active Directory Users. This flaw allows an attacker to disrupt AD DC services.

CVSS metrics

5 scores · 5 sources · 1 version

EPSS trend

Probability

1.32%

Chance of exploitation in the next 30 days

Percentile

71%

Versus all other CVEs

30-day change

Increase +0.21 pp

From 1.10% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Alpine1 product
  • samba≥ 4.18.0, < 4.18.8-r0
Debian1 product
  • samba< 2:4.17.12+dfsg-0+deb12u1 | < 2:4.19.1+dfsg-1
Fedoraproject1 product
Samba1 product
  • samba< 4.17.12 | ≥ 4.18.0, < 4.18.8 | ≥ 4.19.0, < 4.19.1
Ubuntu1 product
  • samba< 2:4.15.13+dfsg-0ubuntu1.5

5 vendors · 5 products

References

12 links
Show all 12 references