CVE-2017-7866

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2022-05-17. 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: 2.5%CVSS: 9.8Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

FFmpeg before 2017-01-23 has an out-of-bounds write caused by a stack-based buffer overflow related to the decode_zbuf function in libavcodec/pngdec.c.

CVSS v3
9.8
EG Score
9.8CRITICALmedium confidence
EG Risk
50
EG Risk 50/100CISA 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
Severity98% × 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
2.5%
EPSS %ILE
84th
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 total (CVSS ≥ 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

April 14, 2017

Last Modified

June 17, 2026

Advisory Details (3)

Auto-updated Oct 5, 2026
Patch available. Sources: github_commit.
github_commit

commit e371f031b942 (FFmpeg/FFmpeg)

Fix landed in FFmpeg/FFmpeg commit e371f031b942 — awaiting tagged release

https://github.com/FFmpeg/FFmpeg/commit/e371f031b942d73e02c090170975561fabd5c264
generic
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=444
generic

CVE-2017-7866 - PSIRT.COM

http://www.securityfocus.com/bid/97664

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
ffmpeg—
  • every version up to 7:3.2.4-1: fixed in 7:3.2.4-1
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
ffmpeg—
  • every version up to 7:3.2.4-1: fixed in 7:3.2.4-1
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
ffmpeg—
  • every version up to 7:3.2.4-1: fixed in 7:3.2.4-1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
ffmpeg—
  • every version up to 7:3.2.4-1: fixed in 7:3.2.4-1
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 8× in last 7d / 29× 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 190 total refreshes for this CVE.

  1. 2026-10-10 19:55 UTCEPSS rescore
  2. 2026-10-09 20:02 UTCEPSS rescore
  3. 2026-10-08 16:36 UTCEPSS rescore
  4. 2026-10-07 23:41 UTCEPSS rescore
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  8. 2026-10-04 07:04 UTCOSV refresh
  9. 2026-10-03 14:21 UTCEPSS rescore
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  11. 2026-09-30 14:59 UTCEPSS rescore
  12. 2026-09-30 09:40 UTCEG score recompute
  13. 2026-09-28 13:45 UTCEPSS rescore
  14. 2026-09-27 13:40 UTCEPSS rescore
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  16. 2026-09-26 15:53 UTCEPSS rescore
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  1. 2026-09-14 21:14 UTCOSV refresh
  2. 2026-09-13 16:42 UTCEPSS rescore
  3. 2026-09-12 14:56 UTCEPSS rescore
  4. 2026-09-11 09:31 UTCEPSS rescore
  5. 2026-09-07 15:56 UTCEPSS rescore
  6. 2026-09-05 15:24 UTCEPSS rescore
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  11. 2026-09-01 03:31 UTCEPSS rescore
  12. 2026-08-30 19:13 UTCEPSS rescore
  13. 2026-08-28 21:36 UTCEPSS rescore
  14. 2026-08-27 14:21 UTCEPSS rescore
  15. 2026-08-26 20:33 UTCOSV refresh
  16. 2026-08-26 14:41 UTCEPSS rescore
  17. 2026-08-25 13:44 UTCEPSS rescore
  18. 2026-08-23 00:14 UTCEPSS rescore
  19. 2026-08-21 23:44 UTCEPSS rescore
  20. 2026-08-19 16:59 UTCEPSS rescore
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  22. 2026-08-16 14:51 UTCEPSS rescore
  23. 2026-08-16 02:10 UTCEPSS rescore
  24. 2026-08-15 01:26 UTCEPSS rescore
  25. 2026-08-12 13:46 UTCEPSS rescore
  26. 2026-08-10 10:40 UTCOSV refresh
  27. 2026-08-09 13:42 UTCEPSS rescore
  28. 2026-08-08 16:32 UTCEPSS rescore
  29. 2026-08-07 16:22 UTCEPSS rescore
  30. 2026-08-06 13:42 UTCEPSS rescore
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  32. 2026-08-05 19:13 UTCEPSS rescore
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  36. 2026-07-30 16:24 UTCEPSS rescore
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  38. 2026-07-28 15:32 UTCEPSS rescore
  39. 2026-07-26 14:51 UTCEPSS rescore
  40. 2026-07-26 14:51 UTCEPSS rescore
  41. 2026-07-25 11:11 UTCOSV refresh
  42. 2026-07-23 14:15 UTCEPSS rescore
  43. 2026-07-23 01:30 UTCEG score recompute
  44. 2026-07-22 22:10 UTCEG score recompute
  45. 2026-07-22 14:04 UTCEPSS rescore
  46. 2026-07-21 15:21 UTCEPSS rescore
  47. 2026-07-20 17:04 UTCEPSS rescore
  48. 2026-07-20 17:04 UTCEPSS rescore
  49. 2026-07-19 14:28 UTCEPSS rescore
  50. 2026-07-19 14:28 UTCEPSS rescore
  51. 2026-07-19 02:26 UTCEPSS rescore
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  53. 2026-07-18 10:01 UTCEPSS rescore
  54. 2026-07-16 16:59 UTCEPSS rescore
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  56. 2026-07-15 16:55 UTCEPSS rescore
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  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. 2026-07-08 06:05 UTCOSV refresh
  67. 2026-07-07 13:42 UTCEPSS rescore
  68. 2026-07-06 16:24 UTCEPSS rescore
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  73. 2026-07-04 06:28 UTCEPSS rescore
  74. 2026-07-04 06:28 UTCEPSS rescore
  75. 2026-07-02 16:54 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2017-7866?
CVE-2017-7866 is a critical vulnerability published on April 14, 2017. FFmpeg before 2017-01-23 has an out-of-bounds write caused by a stack-based buffer overflow related to the decode_zbuf function in libavcodec/pngdec.c.
When was CVE-2017-7866 disclosed?
CVE-2017-7866 was first published on April 14, 2017, 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-2017-7866 actively exploited?
CVE-2017-7866 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 2.5% probability of exploitation in the next 30 days (84th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2017-7866?
CVE-2017-7866 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2017-7866?
A fix for CVE-2017-7866 is available: update to the fixed version the vendor names in its advisory.

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