CVE-2023-42669

MEDIUMNVD 6.56.5—
EchelonGraph scoreMEDIUM confidence

Score 6.5 from GitHub Security Advisory published 2023-11-06. NVD baseline CVSS 6.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
6.5
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 2%CVSS: 6.5Exploit: NoneExposed: 0

A fix is available — apply it.

A vulnerability was found in Samba's "rpcecho" development server, a non-Windows RPC server used to test Samba's DCE/RPC stack elements. This vulnerability stems from an RPC function that can be blocked indefinitely. The issue arises because the "rpcecho" service operates with only one worker in the main RPC task, allowing calls to the "rpcecho" server to be blocked for a specified time, causing service disruptions. This disruption is triggered by a "sleep()" call in the "dcesrv_echo_TestSleep()" function under specific conditions. Authenticated users or attackers can exploit this vulnerability to make calls to the "rpcecho" server, requesting it to block for a specified duration, effectively disrupting most services and leading to a complete denial of service on the AD DC. The DoS affects all other services as "rpcecho" runs in the main RPC task.

CVSS v3
6.5
EG Score
6.5(medium)
EG Risk
30(Track)
EG Risk 30/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity65% × 45%
Exploitation2% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
75.1%
KEV
Not listed

Published

November 6, 2023

Last Modified

June 17, 2026

References (21)

Patch Availability(8)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntuwinbind (2:4.17.7+dfsg-1ubuntu2.3) @ lunar2026-05-24ubuntu
ubuntuwinbind (2:4.18.6+dfsg-1ubuntu2.1) @ mantic2026-05-24ubuntu
redhatsamba-0:4.17.5-4.el8_82023-11-22redhat
redhatsamba-0:4.18.6-2.el8_92023-11-22redhat
redhatsamba-0:4.17.5-104.el9_22023-11-21redhat
redhatsamba-0:4.15.5-13.el8_62023-11-21redhat
redhatsamba-0:4.18.6-101.el9_32023-11-07redhat
redhatsamba-0:4.15.5-111.el9_02023-10-31redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

All Vendor Advisories

(8)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 11× in last 7d / 45× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 110 total refreshes for this CVE.

  1. 2026-07-24 14:16 UTCEPSS rescore
  2. 2026-07-23 14:16 UTCEPSS rescore
  3. 2026-07-23 14:16 UTCEPSS rescore
  4. 2026-07-23 02:26 UTCEG score recompute
  5. 2026-07-22 23:13 UTCEG score recompute
  6. 2026-07-22 14:06 UTCEPSS rescore
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  1. 2026-07-09 19:08 UTCEPSS rescore
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  16. 2026-06-27 05:34 UTCOSV refresh
  17. 2026-06-27 03:07 UTCEPSS rescore
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  19. 2026-06-25 13:48 UTCEPSS rescore
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  21. 2026-06-24 14:04 UTCEPSS rescore
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  23. 2026-06-23 21:31 UTCEPSS rescore
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  25. 2026-06-22 14:24 UTCEPSS rescore
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  27. 2026-06-21 14:55 UTCEPSS rescore
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  40. 2026-06-14 23:16 UTCEPSS rescore
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  43. 2026-06-12 23:10 UTCEPSS rescore
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  45. 2026-06-11 13:59 UTCEPSS rescore
  46. 2026-06-11 13:59 UTCEPSS rescore
  47. 2026-06-10 22:17 UTCEPSS rescore
  48. 2026-06-10 13:21 UTCEPSS rescore
  49. 2026-06-10 13:21 UTCEPSS rescore
  50. 2026-06-09 16:17 UTCOSV refresh
  51. 2026-06-08 14:16 UTCEPSS rescore
  52. 2026-06-08 14:16 UTCEPSS rescore
  53. 2026-06-07 15:23 UTCEPSS rescore
  54. 2026-06-07 15:23 UTCEPSS rescore
  55. 2026-06-06 13:46 UTCEPSS rescore
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  74. 2026-05-28 13:44 UTCEPSS rescore
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Frequently asked(5)

What is CVE-2023-42669?
CVE-2023-42669 is a medium vulnerability published on November 6, 2023. A vulnerability was found in Samba's "rpcecho" development server, a non-Windows RPC server used to test Samba's DCE/RPC stack elements. This vulnerability stems from an RPC function that can be blocked indefinitely. The issue arises because the "rpcecho" service operates with only one worker in…
When was CVE-2023-42669 disclosed?
CVE-2023-42669 was first published in the National Vulnerability Database on November 6, 2023, with the most recent update on June 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2023-42669 actively exploited?
CVE-2023-42669 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 75.1% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2023-42669?
CVE-2023-42669 has a CVSS v3 base score of 6.5 (NVD).
How do I remediate CVE-2023-42669?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-42669, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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