CVE-2023-34966
No exploitation reported by the sources we read.
- Published2023-07-20
- Fixed in4.18.5 · 4.17.10 · 4.16.11
- WeaknessCWE-835
Am I affected?
Debian, Ubuntu or Red Hat sometimes backport a fix without changing the upstream version number: such a version reads « to verify », never « affected ».With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.
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.
Timeline
dates in UTC- 2023-07-2015:15CVE publishedNVD
- 2026-10-2319:23EPSS crossed 10 %FIRST EPSS
Observed activity
isMalicious corpus · updated 2026-10-23 18:48 UTCBlock these indicators
- Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2023-34966?format=txt
- CSV export: https://api.ismalicious.com/edl/cve/CVE-2023-34966?format=csv
- TAXII collection of exploited CVEs
- The EDL and CSV take an API key on the Pro plan.
Versions per branch
NVD| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 4.18 | ≥ 4.18.0, < 4.18.5 | 4.18.5 | NVD |
| 4.17 | ≥ 4.17.0, < 4.17.10 | 4.17.10 | NVD |
| 4.16 | < 4.16.11 | 4.16.11 | NVD |
| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 11.0 | = 11.0 | no fix published | NVD |
| 12.0 | = 12.0 | no fix published | NVD |
| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 37.x | = 37 | no fix published | NVD |
| 38.x | = 38 | no fix published | NVD |
1 more product in the sources.
as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.
Fix
- Update Samba to 4.18.5 · 4.17.10 · 4.16.11
Advisories and patches
- www.samba.orgVendor Advisory
Detection
- Nuclei template
- none so far ProjectDiscovery
- Exploit-DB
- no entry Exploit-DB
- Proof-of-concept repositories
- none listed PoC-in-GitHub
Sources
- CNACVSS 3.17.5read 2026-10-23
- NVDCVSS 3.17.5read 2026-10-23
- CNAweakness (CWE)CWE-835read 2026-10-23
- NVDweakness (CWE)CWE-835read 2026-10-23
- FIRST EPSSEPSS score62.4 %read 2026-10-23
Technical details
- CVSS v3 Vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Published
- 2023-07-20
- Last Modified
- 2026-06-17
- NVD status
- Modified
Frequently asked questions
What is CVE-2023-34966?
Is CVE-2023-34966 actively exploited?
What is the CVSS score for CVE-2023-34966?
Hear about the next vulnerability in your software
Surveillance reads the versions in your stack — a domain, a lockfile or a list — checks each CVE against the ranges its sources publish, and alerts you when one you run is exploited or enters CISA KEV. A version it cannot read stays « version not verified ».
No credit card required · No monthly cap on website lookups · 250 API requests/month
Go further
- Following what attackers exploit right now? The CISA KEV additions of the month, with their patch deadlines.
- Running this software? Vulnerability monitoring alerts you to new vulnerabilities in your products.
Related vulnerabilities
Same product first, then the same vendor advisory and the same publication week.