CVE-2023-34966

HIGHEPSS 99th pctl

7.5

CVSS v3

Description

An infinite loop vulnerability was found in Samba's mdssvc RPC service for Spotlight. When parsing Spotlight mdssvc RPC packets sent by the client, the core unmarshalling function sl_unpack_loop() did not validate a field in the network packet that contains the count of elements in an array-like structure. By passing 0 as the count value, the attacked function will run in an endless loop consuming 100% CPU. This flaw allows an attacker to issue a malformed RPC request, triggering an infinite loop, resulting in a denial of service condition.

CWE-835

How to fix

Remediation Available

sambaDebian

Fixed in:2:4.13.13+dfsg-1~deb11u6CVE-2023-34966

Fixed in:2:4.17.10+dfsg-0+deb12u1CVE-2023-34966

Fixed in:2:4.18.5+dfsg-1CVE-2023-34966

ctdbRed Hat / RHEL

Fixed in:0:4.17.5-5.el8_8RHSA-2024:0580

Fixed in:0:4.15.5-15.el8_6RHSA-2024:0423

Fixed in:0:4.18.6-1.el8RHSA-2023:7139

Fixed in:0:4.15.5-15.el8_6RHSA-2024:0423

Fixed in:0:4.18.6-1.el8RHSA-2023:7139

Fixed in:0:4.15.5-15.el8_6RHSA-2024:0423

Fixed in:0:4.17.5-5.el8_8RHSA-2024:0580

Fixed in:0:4.15.5-15.el8_6RHSA-2024:0423

ctdbRocky

Fixed in:0:4.18.6-1.el8RHSA-2023:7139

Fixed in:0:4.17.5-5.el8_8RHSA-2024:0580

Fixed in:0:4.15.5-15.el8_6RHSA-2024:0423

ctdb-debuginfoRed Hat / RHEL

Fixed in:0:4.17.5-5.el8_8RHSA-2024:0580

Fixed in:0:4.15.5-15.el8_6RHSA-2024:0423

Fixed in:0:4.17.5-5.el8_8RHSA-2024:0580

Fixed in:0:4.18.6-1.el8RHSA-2023:7139

Fixed in:0:4.15.5-15.el8_6RHSA-2024:0423

Fixed in:0:4.18.6-1.el8RHSA-2023:7139

Fixed in:0:4.17.5-5.el8_8RHSA-2024:0580

ctdb-debuginfoRocky

Fixed in:0:4.17.5-5.el8_8RHSA-2024:0580

Fixed in:0:4.18.6-1.el8RHSA-2023:7139

Fixed in:0:4.15.5-15.el8_6RHSA-2024:0423

Fixed in:0:4.18.6-1.el8RHSA-2023:7139

Fixed in:0:4.15.5-15.el8_6RHSA-2024:0423

Fixed in:0:4.17.5-5.el8_8RHSA-2024:0580

evolution-mapiRed Hat / RHEL

Fixed in:0:3.28.3-8.el8RHSA-2023:7139

Fixed in:0:3.40.1-6.el9RHSA-2023:6667

evolution-mapiRocky

Fixed in:0:3.28.3-8.el8RHSA-2023:7139

Fixed in:0:3.40.1-6.el9RHSA-2023:6667

evolution-mapi-debuginfoRocky

Fixed in:0:3.28.3-8.el8RHSA-2023:7139

Fixed in:0:3.40.1-6.el9RHSA-2023:6667

evolution-mapi-debuginfoRed Hat / RHEL

Fixed in:0:3.28.3-8.el8RHSA-2023:7139

Fixed in:0:3.40.1-6.el9RHSA-2023:6667

evolution-mapi-debugsourceRocky

Fixed in:0:3.28.3-8.el8RHSA-2023:7139

Fixed in:0:3.40.1-6.el9RHSA-2023:6667

evolution-mapi-debugsourceRed Hat / RHEL

Fixed in:0:3.28.3-8.el8RHSA-2023:7139

Fixed in:0:3.40.1-6.el9RHSA-2023:6667

evolution-mapi-langpacksRocky

Fixed in:0:3.28.3-8.el8RHSA-2023:7139

Fixed in:0:3.40.1-6.el9RHSA-2023:6667

evolution-mapi-langpacksRed Hat / RHEL

Fixed in:0:3.28.3-8.el8RHSA-2023:7139

Fixed in:0:3.40.1-6.el9RHSA-2023:6667

libnetapiRed Hat / RHEL

Fixed in:0:4.17.5-5.el8_8RHSA-2024:0580

Fixed in:0:4.18.6-1.el8RHSA-2023:7139

Fixed in:0:4.17.5-5.el8_8RHSA-2024:0580

Fixed in:0:4.18.6-1.el8RHSA-2023:7139

Fixed in:0:4.17.5-5.el8_8RHSA-2024:0580

libnetapiRocky

Fixed in:0:4.18.6-1.el8RHSA-2023:7139

Fixed in:0:4.17.5-5.el8_8RHSA-2024:0580

Fixed in:0:4.18.6-1.el8RHSA-2023:7139

Fixed in:0:4.17.5-5.el8_8RHSA-2024:0580

libnetapi-debuginfoRed Hat / RHEL

Fixed in:0:4.18.6-1.el8RHSA-2023:7139

Fixed in:0:4.17.5-5.el8_8RHSA-2024:0580

Fixed in:0:4.18.6-1.el8RHSA-2023:7139

Fixed in:0:4.17.5-5.el8_8RHSA-2024:0580

Fixed in:0:4.18.6-1.el8RHSA-2023:7139

libnetapi-debuginfoRocky

Fixed in:0:4.17.5-5.el8_8RHSA-2024:0580

Fixed in:0:4.18.6-1.el8RHSA-2023:7139

Fixed in:0:4.17.5-5.el8_8RHSA-2024:0580

Fixed in:0:4.18.6-1.el8RHSA-2023:7139

Fixed in:0:4.17.5-5.el8_8RHSA-2024:0580

libnetapi-develRocky

Fixed in:0:4.17.5-5.el8_8RHSA-2024:0580

Fixed in:0:4.18.6-1.el8RHSA-2023:7139

Fixed in:0:4.17.5-5.el8_8RHSA-2024:0580

Fixed in:0:4.18.6-1.el8RHSA-2023:7139

Fixed in:0:4.17.5-5.el8_8RHSA-2024:0580

Fixed in:0:4.18.6-1.el8RHSA-2023:7139

libnetapi-develRed Hat / RHEL

Fixed in:0:4.18.6-1.el8RHSA-2023:7139

Fixed in:0:4.17.5-5.el8_8RHSA-2024:0580

Fixed in:0:4.18.6-1.el8RHSA-2023:7139

Fixed in:0:4.17.5-5.el8_8RHSA-2024:0580

Fixed in:0:4.18.6-1.el8RHSA-2023:7139

Fixed in:0:4.17.5-5.el8_8RHSA-2024:0580

Fixed in:0:4.18.6-1.el8RHSA-2023:7139

libsmbclientRocky

Fixed in:0:4.17.5-5.el8_8RHSA-2024:0580

Fixed in:0:4.15.5-15.el8_6RHSA-2024:0423

Fixed in:0:4.18.6-1.el8RHSA-2023:7139

Fixed in:0:4.15.5-15.el8_6RHSA-2024:0423

Fixed in:0:4.17.5-5.el8_8RHSA-2024:0580

Fixed in:0:4.18.6-1.el8RHSA-2023:7139

libsmbclientRed Hat / RHEL

Fixed in:0:4.18.6-1.el8RHSA-2023:7139

Fixed in:0:4.15.5-15.el8_6RHSA-2024:0423

Fixed in:0:4.17.5-5.el8_8RHSA-2024:0580

Fixed in:0:4.15.5-15.el8_6RHSA-2024:0423

Fixed in:0:4.17.5-5.el8_8RHSA-2024:0580

libsmbclient-debuginfoRed Hat / RHEL

Fixed in:0:4.18.6-1.el8RHSA-2023:7139

Fixed in:0:4.17.5-5.el8_8RHSA-2024:0580

Fixed in:0:4.18.6-1.el8RHSA-2023:7139

Fixed in:0:4.15.5-15.el8_6RHSA-2024:0423

Fixed in:0:4.18.6-1.el8RHSA-2023:7139

libsmbclient-debuginfoRocky

Fixed in:0:4.18.6-1.el8RHSA-2023:7139

Fixed in:0:4.17.5-5.el8_8RHSA-2024:0580

Fixed in:0:4.15.5-15.el8_6RHSA-2024:0423

Fixed in:0:4.18.6-1.el8RHSA-2023:7139

Fixed in:0:4.17.5-5.el8_8RHSA-2024:0580

Fixed in:0:4.15.5-15.el8_6RHSA-2024:0423

Fixed in:0:4.17.5-5.el8_8RHSA-2024:0580

libsmbclient-develRed Hat / RHEL

Fixed in:0:4.18.6-1.el8RHSA-2023:7139

Fixed in:0:4.17.5-5.el8_8RHSA-2024:0580

Fixed in:0:4.15.5-15.el8_6RHSA-2024:0423

Fixed in:0:4.18.6-1.el8RHSA-2023:7139

Fixed in:0:4.15.5-15.el8_6RHSA-2024:0423

Fixed in:0:4.18.6-1.el8RHSA-2023:7139

libsmbclient-develRocky

Fixed in:0:4.18.6-1.el8RHSA-2023:7139

Fixed in:0:4.15.5-15.el8_6RHSA-2024:0423

Fixed in:0:4.17.5-5.el8_8RHSA-2024:0580

Fixed in:0:4.18.6-1.el8RHSA-2023:7139

Fixed in:0:4.17.5-5.el8_8RHSA-2024:0580

Fixed in:0:4.18.6-1.el8RHSA-2023:7139

libwbclientRocky

Fixed in:0:4.17.5-5.el8_8RHSA-2024:0580

Fixed in:0:4.18.6-1.el8RHSA-2023:7139

Fixed in:0:4.15.5-15.el8_6RHSA-2024:0423

Fixed in:0:4.17.5-5.el8_8RHSA-2024:0580

Fixed in:0:4.15.5-15.el8_6RHSA-2024:0423

Fixed in:0:4.18.6-1.el8RHSA-2023:7139

libwbclientRed Hat / RHEL

Fixed in:0:4.15.5-15.el8_6RHSA-2024:0423

Fixed in:0:4.18.6-1.el8RHSA-2023:7139

Fixed in:0:4.15.5-15.el8_6RHSA-2024:0423

Fixed in:0:4.18.6-1.el8RHSA-2023:7139

Fixed in:0:4.17.5-5.el8_8RHSA-2024:0580

libwbclient-debuginfoRed Hat / RHEL

Fixed in:0:4.17.5-5.el8_8RHSA-2024:0580

Fixed in:0:4.18.6-1.el8RHSA-2023:7139

Fixed in:0:4.17.5-5.el8_8RHSA-2024:0580

libwbclient-debuginfoRocky

Fixed in:0:4.17.5-5.el8_8RHSA-2024:0580

Fixed in:0:4.18.6-1.el8RHSA-2023:7139

libwbclient-develRocky

Fixed in:0:4.18.6-1.el8RHSA-2023:7139

Fixed in:0:4.15.5-15.el8_6RHSA-2024:0423

Fixed in:0:4.17.5-5.el8_8RHSA-2024:0580

Fixed in:0:4.18.6-1.el8RHSA-2023:7139

Fixed in:0:4.17.5-5.el8_8RHSA-2024:0580

Fixed in:0:4.18.6-1.el8RHSA-2023:7139

Fixed in:0:4.15.5-15.el8_6RHSA-2024:0423

This vulnerability affects an unusually large number of packages. The highest-confidence fixes are shown above; the full list is longer. Check the referenced advisories for complete coverage.

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Exploit Intelligence

62.40%probability of exploitation in 30 days

99thpercentile

Very high risk: more likely to be exploited than 99% of all known CVEs.

References

Vendor Advisory1

samba.org

Third-Party Advisory4

Other references7

Related Vulnerabilities

Other CWE-835 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2020-13935	High	7.5	87%	-	Fix
CVE-2020-36227	High	7.5	78%	-	Fix
CVE-2022-0778	High	7.5	73%	-	Fix
CVE-2024-20353	High	8.6	71%	KEV	-
CVE-2019-14241	High	7.5	61%	-	-
CVE-2020-7046	High	7.5	51%	-	Fix

Common questions

How do I fix CVE-2023-34966?

Published advisories record a fix for 136 affected products. The "How to fix" section on this page lists the fixed version and source advisory for each one, so apply the entry matching what you actually run.

Is CVE-2023-34966 being actively exploited?

Not that we know of. CVE-2023-34966 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 62.4% is the estimated probability that it will be exploited in the next 30 days. That is higher than 99% of all scored CVEs.

How severe is CVE-2023-34966?

CVE-2023-34966 has a CVSS v3 base score of 7.5, rated high. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2023-34966 affect?

Published advisories record a fix for samba (Debian), ctdb (Red Hat / RHEL), ctdb (Rocky), ctdb-debuginfo (Red Hat / RHEL), and 132 more. Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

Embed a live status badge for CVE-2023-34966

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.