CVE-2023-50269

HIGHNVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.5 under NVD CVSS v3. EPSS exploit probability: 57.6%, top 1% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
Elevated
7.5
EchelonGraph verdictPatch this weekExploitation is likely or a public exploit exists.
  • High exploitation likelihood — EPSS 58%
CISA-KEV: Not listedEPSS: 58%CVSS: 7.5Exploit: NoneExposed: 0

A fix is available — apply it.

Squid is a caching proxy for the Web. Due to an Uncontrolled Recursion bug in versions 2.6 through 2.7.STABLE9, versions 3.1 through 5.9, and versions 6.0.1 through 6.5, Squid may be vulnerable to a Denial of Service attack against HTTP Request parsing. This problem allows a remote client to perform Denial of Service attack by sending a large X-Forwarded-For header when the follow_x_forwarded_for feature is configured. This bug is fixed by Squid version 6.6. In addition, patches addressing this problem for the stable releases can be found in Squid's patch archives.

CVSS v3
7.5
EG Score
7.5(medium)
EG Risk
—
EPSS
99.0%
KEV
Not listed

Published

December 14, 2023

Last Modified

June 17, 2026

References (14)

Vendor Advisories for CVE-2023-50269(8)

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

Patch Availability(11)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntusquidclient (3.5.27-1ubuntu1.14+esm2) @ bionic2026-05-24ubuntu
ubuntusquidclient (5.7-0ubuntu0.22.04.3) @ jammy2026-05-24ubuntu
redhatsquid-7:3.5.20-17.el7_9.102024-04-11redhat
redhatsquid-7:5.5-6.el9_3.82024-03-19redhat
redhatsquid:4-8090020240314114525.a75119d52024-03-19redhat
redhatsquid-7:5.2-1.el9_0.42024-03-05redhat
redhatsquid-7:5.5-5.el9_2.42024-03-05redhat
redhatsquid:4-8040020240122165847.522a0ee42024-02-12redhat
redhatsquid:4-8060020231222131040.ad008a3a2024-02-12redhat
redhatsquid:4-8020020240122164331.4cda2c842024-02-12redhat
redhatsquid:4-8080020231222130009.63b345852024-01-24redhat

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

(3)

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 9× in last 7d / 34× 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▼ 1.10
  2. 2026-07-22 14:06 UTCEPSS rescore
  3. 2026-07-21 15:23 UTCEPSS rescore
  4. 2026-07-21 15:23 UTCEPSS rescore
  5. 2026-07-20 17:06 UTCEPSS rescore
  6. 2026-07-19 02:27 UTCEPSS rescore
  7. 2026-07-18 10:03 UTCEPSS rescore
  8. 2026-07-18 10:03 UTCEPSS rescore
  9. 2026-07-16 17:01 UTCEPSS rescore
  10. 2026-07-15 16:56 UTCEPSS rescore
  11. 2026-07-15 16:56 UTCEPSS rescore
  12. 2026-07-15 00:55 UTCOSV refresh
  13. 2026-07-13 22:28 UTCEPSS rescore
  14. 2026-07-13 22:28 UTCEPSS rescore
  15. 2026-07-13 06:11 UTCEPSS rescore
  16. 2026-07-13 06:11 UTCEPSS rescore
  17. 2026-07-12 05:45 UTCEPSS rescore
  18. 2026-07-11 08:26 UTCEPSS rescore
  19. 2026-07-09 19:08 UTCEPSS rescore
  20. 2026-07-07 13:44 UTCEPSS rescore
  21. 2026-07-07 13:44 UTCEPSS rescore
  22. 2026-07-05 02:29 UTCEPSS rescore
  23. 2026-07-02 16:59 UTCEPSS rescore
  24. 2026-07-01 15:05 UTCEPSS rescore
  25. 2026-06-30 23:21 UTCEPSS rescore
Show 59 more
  1. 2026-06-30 23:21 UTCEPSS rescore
  2. 2026-06-28 04:55 UTCEPSS rescore
  3. 2026-06-27 03:07 UTCEPSS rescore
  4. 2026-06-27 01:39 UTCOSV refresh
  5. 2026-06-25 13:48 UTCEPSS rescore
  6. 2026-06-25 13:48 UTCEPSS rescore
  7. 2026-06-24 06:34 UTCNVD updateCVSS v3 → 7.5
  8. 2026-06-23 21:31 UTCEPSS rescore
  9. 2026-06-23 21:31 UTCEPSS rescore
  10. 2026-06-21 14:55 UTCEPSS rescore
  11. 2026-06-21 14:55 UTCEPSS rescore
  12. 2026-06-21 01:58 UTCEPSS rescore
  13. 2026-06-21 01:58 UTCEPSS rescore
  14. 2026-06-19 19:24 UTCEPSS rescore
  15. 2026-06-19 19:24 UTCEPSS rescore
  16. 2026-06-18 17:51 UTCEPSS rescore
  17. 2026-06-17 17:51 UTCEPSS rescore
  18. 2026-06-16 17:51 UTCEPSS rescore
  19. 2026-06-16 17:51 UTCEPSS rescore
  20. 2026-06-15 17:47 UTCEPSS rescore
  21. 2026-06-14 23:16 UTCEPSS rescore
  22. 2026-06-13 22:59 UTCEPSS rescore
  23. 2026-06-13 22:59 UTCEPSS rescore
  24. 2026-06-12 23:11 UTCEPSS rescore
  25. 2026-06-12 23:10 UTCEPSS rescore
  26. 2026-06-11 13:59 UTCEPSS rescore
  27. 2026-06-10 22:17 UTCEPSS rescore
  28. 2026-06-10 13:21 UTCEPSS rescore
  29. 2026-06-09 12:13 UTCOSV refresh
  30. 2026-06-08 14:16 UTCEPSS rescore
  31. 2026-06-08 14:16 UTCEPSS rescore
  32. 2026-06-07 15:24 UTCEPSS rescore
  33. 2026-06-07 15:23 UTCEPSS rescore
  34. 2026-06-06 13:46 UTCEPSS rescore
  35. 2026-06-06 13:46 UTCEPSS rescore
  36. 2026-06-05 22:46 UTCEPSS rescore
  37. 2026-06-05 22:46 UTCEPSS rescore
  38. 2026-06-05 06:09 UTCEPSS rescore
  39. 2026-06-05 06:09 UTCEPSS rescore
  40. 2026-06-05 06:09 UTCEPSS rescore
  41. 2026-06-04 13:11 UTCEPSS rescore
  42. 2026-06-04 13:11 UTCEPSS rescore
  43. 2026-06-04 13:11 UTCEPSS rescore
  44. 2026-06-02 20:12 UTCEPSS rescore
  45. 2026-06-02 20:12 UTCEPSS rescore
  46. 2026-06-01 13:51 UTCEPSS rescore
  47. 2026-06-01 13:51 UTCEPSS rescore
  48. 2026-05-31 22:30 UTCEPSS rescore
  49. 2026-05-31 22:30 UTCEPSS rescore
  50. 2026-05-31 00:15 UTCEPSS rescore
  51. 2026-05-31 00:15 UTCEPSS rescore
  52. 2026-05-29 13:43 UTCEPSS rescore
  53. 2026-05-28 13:44 UTCEPSS rescore
  54. 2026-05-27 13:39 UTCEPSS rescore
  55. 2026-05-27 13:39 UTCEPSS rescore
  56. 2026-05-26 13:43 UTCEPSS rescore
  57. 2026-05-26 13:43 UTCEPSS rescore
  58. 2026-05-24 12:05 UTCEG score recompute
  59. 2026-05-24 12:05 UTCVendor advisory

Frequently asked(5)

What is CVE-2023-50269?
CVE-2023-50269 is a high vulnerability published on December 14, 2023. Squid is a caching proxy for the Web. Due to an Uncontrolled Recursion bug in versions 2.6 through 2.7.STABLE9, versions 3.1 through 5.9, and versions 6.0.1 through 6.5, Squid may be vulnerable to a Denial of Service attack against HTTP Request parsing. This problem allows a remote client to…
When was CVE-2023-50269 disclosed?
CVE-2023-50269 was first published in the National Vulnerability Database on December 14, 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-2023-50269 actively exploited?
CVE-2023-50269 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 99.0% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2023-50269?
CVE-2023-50269 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2023-50269?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-50269, 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

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