CVE-2020-15094

HIGHNVD 8.08.0—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.0 under NVD CVSS v3. EPSS exploit probability: 3.0% (87th 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
8.0EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 3.0%CVSS: 8.0Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

In Symfony before versions 4.4.13 and 5.1.5, the CachingHttpClient class from the HttpClient Symfony component relies on the HttpCache class to handle requests. HttpCache uses internal headers like X-Body-Eval and X-Body-File to control the restoration of cached responses. The class was initially written with surrogate caching and ESI support in mind (all HTTP calls come from a trusted backend in that scenario). But when used by CachingHttpClient and if an attacker can control the response for a request being made by the CachingHttpClient, remote code execution is possible. This has been fixed in versions 4.4.13 and 5.1.5.

CVSS v3
8.0
EG Score
8.0HIGHmedium confidence
EG Risk
42
EG Risk 42/100CISA 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
Severity80% × 45%
Exploitation3% × 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
3.0%
EPSS %ILE
87th
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

September 2, 2020

Last Modified

November 21, 2024

Advisory Details (6)

Auto-updated Sep 20, 2026
Patch available. Sources: github_commit, github.
generic

[SECURITY] Fedora 32 Update: php-symfony4-4.4.13-1.fc32 - package-announce - Fedora mailing-lists

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VAQJXAKWPMWB7OL6QPG2ZSEQZYYPU5RC/
generic

[SECURITY] Fedora 33 Update: php-symfony4-4.4.13-1.fc33 - package-announce - Fedora mailing-lists

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HNGUWOEETOFVH4PN3I3YO4QZHQ4AUKF3/
githubMentions a patch (unverified)

Prevent RCE when calling untrusted remote with CachingHttpClient · Advisory · symfony/symfony · GitHub

https://github.com/symfony/symfony/security/advisories/GHSA-754h-5r27-7x3r
github_commit

commit d9910e0b33a2 (symfony/symfony)

Fix landed in symfony/symfony commit d9910e0b33a2 — awaiting tagged release

https://github.com/symfony/symfony/commit/d9910e0b33a2e0f993abff41c6fbc86951b66d78
generic

symfony/symfony - Packagist.org

https://packagist.org/packages/symfony/symfony
generic

symfony/http-kernel - Packagist.org

https://packagist.org/packages/symfony/http-kernel

Affected Packages

(6 across 5 ecosystems)
Packagist(2)
PackageVulnerable rangeFix by version rangeDependents
symfony/http-kernelv5.0.0 ... v5.1.4 (20 versions)
  • 4.3.0 up to 4.4.13: fixed in 4.4.13
  • 5.0.0 up to 5.1.5: fixed in 5.1.5
—
symfony/symfonyv5.0.0 ... v5.1.4 (20 versions)
  • 4.3.0 up to 4.4.13: fixed in 4.4.13
  • 5.0.0 up to 5.1.5: fixed in 5.1.5
—
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
symfony—
  • every version up to 4.4.13+dfsg-1: fixed in 4.4.13+dfsg-1
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
symfony—
  • every version up to 4.4.13+dfsg-1: fixed in 4.4.13+dfsg-1
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
symfony—
  • every version up to 4.4.13+dfsg-1: fixed in 4.4.13+dfsg-1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
symfony—
  • every version up to 4.4.13+dfsg-1: fixed in 4.4.13+dfsg-1
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 7× in last 7d / 27× 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 166 total refreshes for this CVE.

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

Related CVEs(same product + same CWE)

Frequently asked(5)

What is CVE-2020-15094?
CVE-2020-15094 is a high vulnerability published on September 2, 2020. In Symfony before versions 4.4.13 and 5.1.5, the CachingHttpClient class from the HttpClient Symfony component relies on the HttpCache class to handle requests. HttpCache uses internal headers like X-Body-Eval and X-Body-File to control the restoration of cached responses. The class was initially…
When was CVE-2020-15094 disclosed?
CVE-2020-15094 was first published on September 2, 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-2020-15094 actively exploited?
CVE-2020-15094 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 3.0% probability of exploitation in the next 30 days (87th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2020-15094?
CVE-2020-15094 has a CVSS v3 base score of 8.0 (NVD).
How do I remediate CVE-2020-15094?
A fix for CVE-2020-15094 is available: update to the fixed version the vendor names in its advisory.

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