CVE-2023-34966
An infinite loop vulnerability was found in Samba's mdssvc RPC service for Spotlight.
Does this matter?
EPSS puts the probability of exploitation in the next 30 days at 62.4%, higher than 99% of all known CVEs. Patch or mitigate before the next change window.
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.
- CVSS 3.1
- 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 62.40% probability · 99th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-835
- Affected
- samba/samba · fedoraproject/fedora · redhat/enterprise linux · debian/debian linux
- Source
- secalert@redhat.com
EPSS 62.4% since 3 November 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- https://access.redhat.com/errata/RHSA-2023:6667Third Party Advisory
- https://access.redhat.com/errata/RHSA-2023:7139Third Party Advisory
- https://access.redhat.com/errata/RHSA-2024:0423
- https://access.redhat.com/errata/RHSA-2024:0580
- https://access.redhat.com/errata/RHSA-2024:4101
- https://access.redhat.com/security/cve/CVE-2023-34966Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2222793Issue Tracking, Third Party Advisory
- https://www.samba.org/samba/security/CVE-2023-34966Vendor Advisory
- https://access.redhat.com/errata/RHSA-2023:6667Third Party Advisory
- https://access.redhat.com/errata/RHSA-2023:7139Third Party Advisory
- https://access.redhat.com/errata/RHSA-2024:0423
- https://access.redhat.com/errata/RHSA-2024:0580
- https://access.redhat.com/errata/RHSA-2024:4101
- https://access.redhat.com/security/cve/CVE-2023-34966Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2222793Issue Tracking, Third Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/BPCSGND7LO467AJGR5DYBGZLTCGTOBCC/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/OT74M42E6C36W7PQVY3OS4ZM7DVYB64Z/
- https://security.netapp.com/advisory/ntap-20230731-0010/
- https://www.debian.org/security/2023/dsa-5477
- https://www.samba.org/samba/security/CVE-2023-34966Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.