CVE-2017-5396

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2022-05-14. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 4%CVSS: 9.8Exploit: None knownExposed: 0

A fix is available — apply it.

A use-after-free vulnerability in the Media Decoder when working with media files when some events are fired after the media elements are freed from memory. This vulnerability affects Thunderbird < 45.7, Firefox ESR < 45.7, and Firefox < 51.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
50(Track)
EG Risk 50/100SSVC: 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%
Exploitation4% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
4%
EPSS %ILE
90%
KEV
Not listed

Published

June 11, 2018

Last Modified

November 25, 2025

Advisory Details (10)

Auto-updated Aug 20, 2026
No patch confirmed yet.
generic

Security vulnerabilities fixed in Firefox 51 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2017-01/
generic

[SECURITY] [DSA 3832-1] icedove security update

https://www.debian.org/security/2017/dsa-3832
generic

[SECURITY] [DSA 3771-1] firefox-esr security update

https://www.debian.org/security/2017/dsa-3771
generic

Mozilla Firefox: Multiple vulnerabilities (GLSA 201702-22) — Gentoo security

https://security.gentoo.org/glsa/201702-22
generic

Mozilla Thunderbird: Multiple vulnerabilities (GLSA 201702-13) — Gentoo security

https://security.gentoo.org/glsa/201702-13
generic

1329403 - (CVE-2017-5396) BaseMediaResource::ModifyLoadFlags Use-After-Free using MP4 video.

https://bugzilla.mozilla.org/show_bug.cgi?id=1329403
generic
http://www.securitytracker.com/id/1037693
generic

CVE-2017-5378 - PSIRT.COM

http://www.securityfocus.com/bid/95769
generic
http://rhn.redhat.com/errata/RHSA-2017-0238.html
generic
http://rhn.redhat.com/errata/RHSA-2017-0190.html

Patch Availability(4)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntufirefox-testsuite (51.0.1+build2-0ubuntu0.16.04.1) @ xenial2026-05-28ubuntu
ubuntuxul-ext-lightning (1:45.7.0+build1-0ubuntu0.14.04.1) @ trusty2026-05-28ubuntu
redhatthunderbird-0:45.7.0-1.el7_32017-02-02redhat
redhatfirefox-0:45.7.0-2.el7_32017-01-25redhat

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

(8 across 6 ecosystems)
Debian:7(2)
PackageVulnerable rangeFixed inDependents
firefox-esr45.0.1esr-1 ... 45.6.0esr-1~deb8u1 (27 versions)45.7.0esr-1~deb7u1—
icedove10.0.12-1 ... 44.0~b1-1 (133 versions)1:45.8.0-3~deb7u1—
Debian:8(2)
PackageVulnerable rangeFixed inDependents
firefox-esr45.0.1esr-1 ... 45.7.0esr-1~deb7u1 (28 versions)45.7.0esr-1~deb8u1—
icedove1:45.0~b4-1 ... 44.0~b1-1 (80 versions)1:45.8.0-3~deb8u1—
Debian:11(1)
PackageVulnerable rangeFixed inDependents
firefox-esr—45.7.0esr-1—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
firefox-esr—45.7.0esr-1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
firefox-esr—45.7.0esr-1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
firefox-esr—45.7.0esr-1—

Weakness Classification(1)

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 5× in last 7d / 20× 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 111 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2017-5396?
CVE-2017-5396 is a critical vulnerability published on June 11, 2018. A use-after-free vulnerability in the Media Decoder when working with media files when some events are fired after the media elements are freed from memory. This vulnerability affects Thunderbird < 45.7, Firefox ESR < 45.7, and Firefox < 51.
When was CVE-2017-5396 disclosed?
CVE-2017-5396 was first published in the National Vulnerability Database on June 11, 2018, with the most recent update on November 25, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2017-5396 actively exploited?
CVE-2017-5396 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 4% probability of exploitation in the next 30 days, which ranks it in the top 10.1% of all scored CVEs.
What is the CVSS score of CVE-2017-5396?
CVE-2017-5396 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2017-5396?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2017-5396, 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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