CVE-2023-50868

HIGHNVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2024-02-14. NVD baseline CVSS 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Elevated
7.5
EchelonGraph verdictPatch this weekExploitation is likely or a public exploit exists.
  • High exploitation likelihood — EPSS 82%
CISA-KEV: Not listedEPSS: 82%CVSS: 7.5Exploit: NoneExposed: 0

A fix is available — apply it.

The Closest Encloser Proof aspect of the DNS protocol (in RFC 5155 when RFC 9276 guidance is skipped) allows remote attackers to cause a denial of service (CPU consumption for SHA-1 computations) via DNSSEC responses in a random subdomain attack, aka the "NSEC3" issue. The RFC 5155 specification implies that an algorithm must perform thousands of iterations of a hash function in certain situations.

CVSS v3
7.5
EG Score
7.5(medium)
EG Risk
—
EPSS
99.6%
KEV
Not listed

Published

February 14, 2024

Last Modified

December 23, 2025

References (53)

Vendor Advisories for CVE-2023-50868(9)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(30)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatbind-dyndb-ldap-0:2.3-8.el6_10.12025-01-06redhat
redhatunbound-0:1.6.6-5.el7_9.12024-12-12redhat
redhatdnsmasq-0:2.79-15.el8_4.22024-06-13redhat
redhatdnsmasq-0:2.79-11.el8_2.32024-06-13redhat
redhatdhcp-12:4.2.5-83.el7_9.22024-06-10redhat
redhatbind-32:9.11.36-14.el8_102024-05-22redhat
redhatdhcp-12:4.3.6-40.el8_2.32024-05-16redhat
redhatdhcp-12:4.3.6-44.el8_4.32024-05-13redhat
redhatdhcp-12:4.3.6-49.el8_8.12024-05-07redhat
redhatdhcp-12:4.3.6-47.el8_6.22024-05-07redhat
redhatunbound-0:1.7.3-12.el8_2.12024-05-06redhat
redhatunbound-0:1.7.3-15.el8_4.12024-04-30redhat
redhatbind-dyndb-ldap-0:11.9-9.el9_42024-04-30redhat
redhatbind-dyndb-ldap-0:11.9-7.el9_0.12024-04-15redhat
redhatunbound-0:1.13.1-13.el9_0.42024-04-15redhat
redhatbind-dyndb-ldap-0:11.9-8.el9_2.22024-04-15redhat
redhatunbound-0:1.7.3-17.el8_6.42024-04-15redhat
redhatbind-32:9.11.36-11.el8_9.12024-04-12redhat
redhatbind9.16-32:9.16.23-0.16.el8_9.22024-04-11redhat
redhatbind-dyndb-ldap-0:11.9-8.el9_3.32024-04-11redhat
redhatbind9.16-32:9.16.23-0.7.el8_6.52024-04-02redhat
redhatbind9.16-32:9.16.23-0.14.el8_8.42024-04-02redhat
redhatdnsmasq-0:2.79-21.el8_6.52024-03-27redhat
redhatdnsmasq-0:2.79-26.el8_8.42024-03-27redhat
redhatdnsmasq-0:2.85-3.el9_0.12024-03-27redhat
redhatdnsmasq-0:2.85-6.el9_2.32024-03-26redhat
redhatdnsmasq-0:2.79-31.el8_9.22024-03-14redhat
redhatdnsmasq-0:2.85-14.el9_3.12024-03-14redhat
redhatunbound-0:1.16.2-5.el8_8.12024-02-27redhat
redhatunbound-0:1.16.2-3.el9_2.12024-02-26redhat

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.

Additional Vendor Advisories

(17)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 6× in last 7d / 23× 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.

  1. 2026-07-22 23:15 UTCEG score recompute
  2. 2026-07-22 14:06 UTCEPSS rescore
  3. 2026-07-20 17:06 UTCEPSS rescore
  4. 2026-07-19 14:29 UTCEPSS rescore
  5. 2026-07-19 14:29 UTCEPSS rescore
  6. 2026-07-19 02:27 UTCEPSS rescore
  7. 2026-07-15 16:56 UTCEPSS rescore
  8. 2026-07-15 16:56 UTCEPSS rescore
  9. 2026-07-15 01:59 UTCEPSS rescore
  10. 2026-07-15 01:59 UTCEPSS rescore
  11. 2026-07-14 19:40 UTCOSV refresh
  12. 2026-07-11 08:26 UTCEPSS rescore
  13. 2026-07-07 13:44 UTCEPSS rescore
  14. 2026-07-07 13:44 UTCEPSS rescore
  15. 2026-07-02 16:59 UTCEPSS rescore
  16. 2026-07-01 15:05 UTCEPSS rescore
  17. 2026-06-28 04:55 UTCEPSS rescore
  18. 2026-06-27 03:07 UTCEPSS rescore
  19. 2026-06-26 20:37 UTCOSV refresh
  20. 2026-06-25 13:48 UTCEPSS rescore
  21. 2026-06-25 13:48 UTCEPSS rescore
  22. 2026-06-23 21:31 UTCEPSS rescore
  23. 2026-06-23 21:31 UTCEPSS rescore
  24. 2026-06-21 01:58 UTCEPSS rescore
  25. 2026-06-21 01:58 UTCEPSS rescore
Show 46 more
  1. 2026-06-16 17:51 UTCEPSS rescore
  2. 2026-06-16 17:51 UTCEPSS rescore
  3. 2026-06-15 17:47 UTCEPSS rescore
  4. 2026-06-14 23:16 UTCEPSS rescore
  5. 2026-06-13 22:59 UTCEPSS rescore
  6. 2026-06-13 22:59 UTCEPSS rescore
  7. 2026-06-12 23:11 UTCEPSS rescore
  8. 2026-06-12 23:10 UTCEPSS rescore
  9. 2026-06-11 13:59 UTCEPSS rescore
  10. 2026-06-10 22:17 UTCEPSS rescore
  11. 2026-06-10 13:21 UTCEPSS rescore
  12. 2026-06-09 06:30 UTCOSV refresh
  13. 2026-06-08 14:16 UTCEPSS rescore
  14. 2026-06-08 14:16 UTCEPSS rescore
  15. 2026-06-07 15:24 UTCEPSS rescore
  16. 2026-06-07 15:23 UTCEPSS rescore
  17. 2026-06-06 13:46 UTCEPSS rescore
  18. 2026-06-06 13:46 UTCEPSS rescore
  19. 2026-06-05 22:46 UTCEPSS rescore
  20. 2026-06-05 22:46 UTCEPSS rescore
  21. 2026-06-05 06:09 UTCEPSS rescore
  22. 2026-06-05 06:09 UTCEPSS rescore
  23. 2026-06-05 06:09 UTCEPSS rescore
  24. 2026-06-04 13:11 UTCEPSS rescore
  25. 2026-06-04 13:11 UTCEPSS rescore
  26. 2026-06-04 13:11 UTCEPSS rescore
  27. 2026-06-02 20:12 UTCEPSS rescore
  28. 2026-06-02 20:12 UTCEPSS rescore
  29. 2026-06-01 13:51 UTCEPSS rescore
  30. 2026-06-01 13:51 UTCEPSS rescore
  31. 2026-05-31 22:30 UTCEPSS rescore
  32. 2026-05-31 22:30 UTCEPSS rescore
  33. 2026-05-31 00:15 UTCEPSS rescore
  34. 2026-05-31 00:15 UTCEPSS rescore
  35. 2026-05-29 13:43 UTCEPSS rescore
  36. 2026-05-28 13:44 UTCEPSS rescore
  37. 2026-05-27 13:39 UTCEPSS rescore
  38. 2026-05-27 13:39 UTCEPSS rescore
  39. 2026-05-26 13:43 UTCEPSS rescore
  40. 2026-05-26 13:43 UTCEPSS rescore
  41. 2026-05-26 07:18 UTCEPSS rescore
  42. 2026-05-26 07:18 UTCEPSS rescore
  43. 2026-05-26 07:18 UTCEPSS rescore
  44. 2026-05-24 08:31 UTCEG score recompute
  45. 2026-05-24 08:31 UTCVendor advisory
  46. 2026-05-24 08:31 UTCGHSA enrichment

Publicly available exploits

(1 reference)

Working exploit code is in the public domain (1 GitHub PoC). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoCGoethe-Universitat-Cybersecurity/NSEC3-Encloser-Attack
    First seen Mar 19, 2024

    This project generates DNS zonefiles with custom NSEC3 parameters to reproduce and evaluate the attacks in CVE-2023-50868.

    Open source ↗

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2023-50868?
CVE-2023-50868 is a high vulnerability published on February 14, 2024. The Closest Encloser Proof aspect of the DNS protocol (in RFC 5155 when RFC 9276 guidance is skipped) allows remote attackers to cause a denial of service (CPU consumption for SHA-1 computations) via DNSSEC responses in a random subdomain attack, aka the "NSEC3" issue. The RFC 5155 specification…
When was CVE-2023-50868 disclosed?
CVE-2023-50868 was first published in the National Vulnerability Database on February 14, 2024, with the most recent update on December 23, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2023-50868 actively exploited?
CVE-2023-50868 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 99.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2023-50868?
CVE-2023-50868 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2023-50868?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-50868, 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.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2023-50868

Explore →

Is Your Infrastructure Affected by CVE-2023-50868?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs