CVE-2019-12525

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2022-05-24. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Elevated
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 24%CVSS: 9.8Exploit: Elevated riskExposed: 0

A fix is available — apply it.

An issue was discovered in Squid 3.3.9 through 3.5.28 and 4.x through 4.7. When Squid is configured to use Digest authentication, it parses the header Proxy-Authorization. It searches for certain tokens such as domain, uri, and qop. Squid checks if this token's value starts with a quote and ends with one. If so, it performs a memcpy of its length minus 2. Squid never checks whether the value is just a single quote (which would satisfy its requirements), leading to a memcpy of its length minus 1.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
65(Track*)
EG Risk 65/100SSVC: 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
Severity98% × 45%
Exploitation40% × 40%
Automatability30% × 15%
Action: Watch closely — could escalate to Attend.
EPSS PROB
24%
EPSS %ILE
98%
KEV
Not listed

Published

July 11, 2019

Last Modified

November 21, 2024

Advisory Details (7)

Auto-updated Sep 14, 2026
Patch available.
generic

Bugtraq: [SECURITY] [DSA 4507-1] squid security update

https://seclists.org/bugtraq/2019/Aug/42
generic

[SECURITY] Fedora 29 Update: squid-4.8-2.fc29 - package-announce - Fedora mailing-lists

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SPXN2CLAGN5QSQBTOV5IGVLDOQSRFNTZ/
generic Patch Available

[SECURITY] [DLA 2278-1] squid3 security update

https://lists.debian.org/debian-lts-announce/2020/07/msg00009.html
generic Patch Available

[SECURITY] [DLA 1858-1] squid3 security update

https://lists.debian.org/debian-lts-announce/2019/07/msg00018.html
generic

Commits · squid-cache/squid · GitHub

https://github.com/squid-cache/squid/commits/v4
generic

squid : Optimising Web Delivery

http://www.squid-cache.org/Versions/v4/changesets/squid-4-7f73e9c5d17664b882ed32590e6af310c247f320.patch
generic

squid : Optimising Web Delivery

http://www.squid-cache.org/Versions/v4/changesets/

Patch Availability(4)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntusquid3 (3.1.19-1ubuntu3.12.04.10) @ precise2026-05-27ubuntu
ubuntusquidclient (3.5.12-1ubuntu7.8) @ xenial2026-05-27ubuntu
redhatsquid-7:3.5.20-15.el7_8.12020-05-06redhat
redhatsquid:4-8020020200430095908.4cda2c842020-05-06redhat

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.

Affected Packages

(9 across 9 ecosystems)
Alpine:v3.10(1)
PackageVulnerable rangeFixed inDependents
squid—4.8-r0—
Alpine:v3.9(1)
PackageVulnerable rangeFixed inDependents
squid—4.8-r0—
Debian:10(1)
PackageVulnerable rangeFixed inDependents
squid4.6-14.6-1+deb10u1—
Debian:11(1)
PackageVulnerable rangeFixed inDependents
squid—4.8-1—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
squid—4.8-1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
squid—4.8-1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
squid—4.8-1—
Debian:8(1)
PackageVulnerable rangeFixed inDependents
squid33.4.8-6 ... 3.4.8-6+deb8u7 (9 versions)3.4.8-6+deb8u8—
Debian:9(1)
PackageVulnerable rangeFixed inDependents
squid33.5.23-5, 3.5.23-5+deb9u13.5.23-5+deb9u2—

Weakness Classification(2)

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

All Vendor Advisories

(4)

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 4× in last 7d / 22× 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 133 total refreshes for this CVE.

  1. 2026-09-18 19:22 UTCEPSS rescore
  2. 2026-09-17 19:22 UTCEPSS rescore
  3. 2026-09-16 14:04 UTCEPSS rescore
  4. 2026-09-15 03:05 UTCEPSS rescore
  5. 2026-09-13 16:42 UTCEPSS rescore
  6. 2026-09-12 14:56 UTCEPSS rescore
  7. 2026-09-11 14:48 UTCEPSS rescore
  8. 2026-09-08 21:55 UTCEPSS rescore
  9. 2026-09-08 08:46 UTCOSV refresh
  10. 2026-09-07 15:57 UTCEPSS rescore
  11. 2026-09-06 13:44 UTCEPSS rescore
  12. 2026-09-05 15:24 UTCEPSS rescore
  13. 2026-09-04 13:56 UTCEPSS rescore
  14. 2026-09-04 05:02 UTCEPSS rescore
  15. 2026-09-02 14:07 UTCEPSS rescore
  16. 2026-09-01 03:32 UTCEPSS rescore
  17. 2026-08-30 19:13 UTCEPSS rescore
  18. 2026-08-30 01:18 UTCEPSS rescore
  19. 2026-08-28 21:36 UTCEPSS rescore
  20. 2026-08-27 14:21 UTCEPSS rescore
  21. 2026-08-26 14:42 UTCEPSS rescore
  22. 2026-08-25 13:45 UTCEPSS rescore
  23. 2026-08-21 23:45 UTCEPSS rescore
  24. 2026-08-21 18:44 UTCOSV refresh
  25. 2026-08-20 22:51 UTCEPSS rescore
Show 75 more
  1. 2026-08-19 17:00 UTCEPSS rescore
  2. 2026-08-18 13:44 UTCEPSS rescore
  3. 2026-08-17 13:43 UTCEPSS rescore
  4. 2026-08-16 14:52 UTCEPSS rescore
  5. 2026-08-16 02:10 UTCEPSS rescore
  6. 2026-08-15 01:26 UTCEPSS rescore
  7. 2026-08-13 21:56 UTCEPSS rescore
  8. 2026-08-12 13:47 UTCEPSS rescore
  9. 2026-08-08 16:33 UTCEPSS rescore
  10. 2026-08-07 16:23 UTCEPSS rescore
  11. 2026-08-06 13:43 UTCEPSS rescore
  12. 2026-08-06 02:54 UTCOSV refresh
  13. 2026-08-05 19:13 UTCEPSS rescore
  14. 2026-08-04 15:05 UTCEPSS rescore
  15. 2026-08-04 10:33 UTCEPSS rescore
  16. 2026-08-03 10:31 UTCEPSS rescore
  17. 2026-08-02 02:23 UTCEPSS rescore
  18. 2026-08-01 04:12 UTCEPSS rescore
  19. 2026-07-30 16:24 UTCEPSS rescore
  20. 2026-07-30 01:27 UTCEPSS rescore
  21. 2026-07-28 15:32 UTCEPSS rescore
  22. 2026-07-26 14:51 UTCEPSS rescore
  23. 2026-07-25 14:14 UTCEPSS rescore
  24. 2026-07-24 14:14 UTCEPSS rescore
  25. 2026-07-24 14:14 UTCEPSS rescore
  26. 2026-07-23 14:15 UTCEPSS rescore
  27. 2026-07-23 01:39 UTCEG score recompute
  28. 2026-07-22 22:19 UTCEG score recompute
  29. 2026-07-22 14:05 UTCEPSS rescore
  30. 2026-07-21 15:22 UTCEPSS rescore
  31. 2026-07-21 15:22 UTCEPSS rescore
  32. 2026-07-20 17:04 UTCEPSS rescore
  33. 2026-07-20 12:34 UTCOSV refresh
  34. 2026-07-19 14:28 UTCEPSS rescore
  35. 2026-07-19 14:28 UTCEPSS rescore
  36. 2026-07-19 02:26 UTCEPSS rescore
  37. 2026-07-19 02:26 UTCEPSS rescore
  38. 2026-07-18 10:01 UTCEPSS rescore
  39. 2026-07-16 16:59 UTCEPSS rescore
  40. 2026-07-16 16:59 UTCEPSS rescore
  41. 2026-07-15 16:55 UTCEPSS rescore
  42. 2026-07-13 22:27 UTCEPSS rescore
  43. 2026-07-13 06:10 UTCEPSS rescore
  44. 2026-07-13 06:10 UTCEPSS rescore
  45. 2026-07-12 05:43 UTCEPSS rescore
  46. 2026-07-11 08:24 UTCEPSS rescore
  47. 2026-07-09 19:06 UTCEPSS rescore
  48. 2026-07-08 15:11 UTCEPSS rescore
  49. 2026-07-06 16:25 UTCEPSS rescore
  50. 2026-07-06 02:20 UTCEPSS rescore
  51. 2026-07-05 02:27 UTCEPSS rescore
  52. 2026-07-04 06:28 UTCEPSS rescore
  53. 2026-07-04 06:28 UTCEPSS rescore
  54. 2026-07-03 07:56 UTCOSV refresh
  55. 2026-07-02 16:56 UTCEPSS rescore
  56. 2026-07-01 15:03 UTCEPSS rescore
  57. 2026-07-01 15:03 UTCEPSS rescore
  58. 2026-06-29 14:03 UTCEPSS rescore
  59. 2026-06-28 14:04 UTCEPSS rescore
  60. 2026-06-28 04:54 UTCEPSS rescore
  61. 2026-06-28 04:53 UTCEPSS rescore
  62. 2026-06-27 03:06 UTCEPSS rescore
  63. 2026-06-27 03:06 UTCEPSS rescore
  64. 2026-06-25 13:47 UTCEPSS rescore
  65. 2026-06-25 13:47 UTCEPSS rescore
  66. 2026-06-24 14:03 UTCEPSS rescore
  67. 2026-06-24 14:02 UTCEPSS rescore
  68. 2026-06-23 21:30 UTCEPSS rescore
  69. 2026-06-23 21:30 UTCEPSS rescore
  70. 2026-06-22 14:23 UTCEPSS rescore
  71. 2026-06-22 14:23 UTCEPSS rescore
  72. 2026-06-21 14:54 UTCEPSS rescore
  73. 2026-06-21 14:54 UTCEPSS rescore
  74. 2026-06-21 01:57 UTCEPSS rescore
  75. 2026-06-21 01:57 UTCEPSS rescore

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2019-12525?
CVE-2019-12525 is a critical vulnerability published on July 11, 2019. An issue was discovered in Squid 3.3.9 through 3.5.28 and 4.x through 4.7. When Squid is configured to use Digest authentication, it parses the header Proxy-Authorization. It searches for certain tokens such as domain, uri, and qop. Squid checks if this token's value starts with a quote and ends…
When was CVE-2019-12525 disclosed?
CVE-2019-12525 was first published in the National Vulnerability Database on July 11, 2019, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2019-12525 actively exploited?
CVE-2019-12525 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 24% probability of exploitation in the next 30 days, which ranks it in the top 2.2% of all scored CVEs.
What is the CVSS score of CVE-2019-12525?
CVE-2019-12525 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2019-12525?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2019-12525, 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

See which npm, PyPI, Go, and Maven packages are affected by CVE-2019-12525

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