CVE-2020-24606

HIGHNVD 8.68.6—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.6 under NVD CVSS v3. EPSS exploit probability: 5.0% (91st percentile of EPSS-scored CVEs). 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
8.6EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 5.0%CVSS: 8.6Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Squid before 4.13 and 5.x before 5.0.4 allows a trusted peer to perform Denial of Service by consuming all available CPU cycles during handling of a crafted Cache Digest response message. This only occurs when cache_peer is used with the cache digests feature. The problem exists because peerDigestHandleReply() livelocking in peer_digest.cc mishandles EOF.

CVSS v3
8.6
EG Score
8.6HIGHmedium confidence
EG Risk
45
EG Risk 45/100CISA SSVC

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
Severity86% × 45%
Exploitation5% × 40%
Automatability30% × 15%
CISA SSVC: Track at low or medium mission impact; Track or Attend at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
5.0%
EPSS %ILE
91st
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track or Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (no KEV listing, exploit record or EPSS ≥ 50%) · Automatable unknown (not published for this CVE) · Technical impact partial (CVSS below 9.0). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

August 24, 2020

Last Modified

November 21, 2024

Advisory Details (8)

Auto-updated Sep 1, 2026
Patch available. Sources: github.
generic

NetApp Product Security

https://security.netapp.com/advisory/ntap-20210226-0006/
generic

NetApp Product Security

https://security.netapp.com/advisory/ntap-20210219-0007/
generic

[SECURITY] Fedora 31 Update: squid-4.13-1.fc31 - package-announce - Fedora mailing-lists

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HJJDI7JQFGQLVNCKMVY64LAFMKERAOK7/
generic

[SECURITY] Fedora 32 Update: squid-4.13-1.fc32 - package-announce - Fedora mailing-lists

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BMTFLVB7GLRF2CKGFPZ4G4R5DIIPHWI3/
generic

[SECURITY] Fedora 33 Update: squid-4.13-1.fc33 - package-announce - Fedora mailing-lists

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BE6FKUN7IGTIR2MEEMWYDT7N5EJJLZI2/
genericMentions a patch (unverified)

[SECURITY] [DLA 2394-1] squid3 security update

https://lists.debian.org/debian-lts-announce/2020/10/msg00005.html
githubMentions a patch (unverified)

SQUID-2020:9 Denial of Service processing Cache Digest Response · Advisory · squid-cache/squid · GitHub

https://github.com/squid-cache/squid/security/advisories/GHSA-vvj7-xjgq-g2jg
generic

squid : Optimising Web Delivery

http://www.squid-cache.org/Versions/v4/changesets/SQUID-2020_9.patch

Vendor Advisories for CVE-2020-24606(1)

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

Patch Availability(4)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubuntusquidclient (4.10-1ubuntu1.2) @ focal2026-05-26ubuntu
ubuntusquidclient (3.5.12-1ubuntu7.15) @ xenial2026-05-26ubuntu
redhatsquid:4-8030020200828070549.30b713e62020-11-04redhat
redhatsquid-7:3.5.20-17.el7_9.42020-09-30redhat

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

(22 across 22 ecosystems)
Alpine:v3.10(1)
PackageVulnerable rangeFix by version rangeDependents
squid—
  • 3.0 up to 4.13-r0: fixed in 4.13-r0
—
Alpine:v3.11(1)
PackageVulnerable rangeFix by version rangeDependents
squid—
  • 3.0 up to 4.13-r0: fixed in 4.13-r0
—
Alpine:v3.12(1)
PackageVulnerable rangeFix by version rangeDependents
squid—
  • 3.0 up to 4.13-r0: fixed in 4.13-r0
—
Alpine:v3.13(1)
PackageVulnerable rangeFix by version rangeDependents
squid—
  • 3.0 up to 4.13.0-r0: fixed in 4.13.0-r0
—
Alpine:v3.14(1)
PackageVulnerable rangeFix by version rangeDependents
squid—
  • 3.0 up to 4.13.0-r0: fixed in 4.13.0-r0
—
Alpine:v3.15(1)
PackageVulnerable rangeFix by version rangeDependents
squid—
  • 3.0 up to 4.13.0-r0: fixed in 4.13.0-r0
—
Alpine:v3.16(1)
PackageVulnerable rangeFix by version rangeDependents
squid—
  • 3.0 up to 4.13.0-r0: fixed in 4.13.0-r0
—
Alpine:v3.17(1)
PackageVulnerable rangeFix by version rangeDependents
squid—
  • 3.0 up to 4.13.0-r0: fixed in 4.13.0-r0
—
Alpine:v3.18(1)
PackageVulnerable rangeFix by version rangeDependents
squid—
  • 3.0 up to 4.13.0-r0: fixed in 4.13.0-r0
—
Alpine:v3.19(1)
PackageVulnerable rangeFix by version rangeDependents
squid—
  • 3.0 up to 4.13.0-r0: fixed in 4.13.0-r0
—
Alpine:v3.20(1)
PackageVulnerable rangeFix by version rangeDependents
squid—
  • 3.0 up to 4.13.0-r0: fixed in 4.13.0-r0
—
Alpine:v3.21(1)
PackageVulnerable rangeFix by version rangeDependents
squid—
  • 3.0 up to 4.13.0-r0: fixed in 4.13.0-r0
—
Alpine:v3.22(1)
PackageVulnerable rangeFix by version rangeDependents
squid—
  • 3.0 up to 4.13.0-r0: fixed in 4.13.0-r0
—
Alpine:v3.23(1)
PackageVulnerable rangeFix by version rangeDependents
squid—
  • 3.0 up to 4.13.0-r0: fixed in 4.13.0-r0
—
Alpine:v3.24(1)
PackageVulnerable rangeFix by version rangeDependents
squid—
  • 3.0 up to 4.13.0-r0: fixed in 4.13.0-r0
—
Alpine:v3.9(1)
PackageVulnerable rangeFix by version rangeDependents
squid—
  • 3.0 up to 4.13-r0: fixed in 4.13-r0
—
Debian:10(1)
PackageVulnerable rangeFix by version rangeDependents
squid4.6-1, 4.6-1+deb10u1, 4.6-1+deb10u2, 4.6-1+deb10u3
  • every version up to 4.6-1+deb10u4: fixed in 4.6-1+deb10u4
—
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
squid—
  • every version up to 4.13-1: fixed in 4.13-1
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
squid—
  • every version up to 4.13-1: fixed in 4.13-1
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
squid—
  • every version up to 4.13-1: fixed in 4.13-1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
squid—
  • every version up to 4.13-1: fixed in 4.13-1
—
Debian:9(1)
PackageVulnerable rangeFix by version rangeDependents
squid33.5.23-5, 3.5.23-5+deb9u1, 3.5.23-5+deb9u2, 3.5.23-5+deb9u3, 3.5.23-5+deb9u4
  • every version up to 3.5.23-5+deb9u5: fixed in 3.5.23-5+deb9u5
—

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 7× in last 7d / 30× 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 172 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2020-24606?
CVE-2020-24606 is a high vulnerability published on August 24, 2020. Squid before 4.13 and 5.x before 5.0.4 allows a trusted peer to perform Denial of Service by consuming all available CPU cycles during handling of a crafted Cache Digest response message. This only occurs when cachepeer is used with the cache digests feature. The problem exists because…
When was CVE-2020-24606 disclosed?
CVE-2020-24606 was first published on August 24, 2020, 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-2020-24606 actively exploited?
CVE-2020-24606 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 5.0% probability of exploitation in the next 30 days (91st percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2020-24606?
CVE-2020-24606 has a CVSS v3 base score of 8.6 (NVD).
How do I remediate CVE-2020-24606?
A fix for CVE-2020-24606 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2020-24606 are linked in the Vendor Advisories panel on this page.

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