CVE-2020-11558

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.8 under NVD CVSS v3. EPSS exploit probability: 1.5% (73rd 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
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1.5%CVSS: 9.8Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

An issue was discovered in libgpac.a in GPAC 0.8.0, as demonstrated by MP4Box. audio_sample_entry_Read in isomedia/box_code_base.c does not properly decide when to make gf_isom_box_del calls. This leads to various use-after-free outcomes involving mdia_Read, gf_isom_delete_movie, and gf_isom_parse_movie_boxes.

CVSS v3
9.8
EG Score
9.8CRITICALmedium confidence
EG Risk
49
EG Risk 49/100CISA 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%
Exploitation2% × 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
1.5%
EPSS %ILE
74th
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 5, 2020

Last Modified

November 21, 2024

Advisory Details (2)

Auto-updated Oct 4, 2026
Patch available. Sources: github_commit.
generic

3 UAF bugs in box_funcs.c · Issue #1440 · gpac/gpac · GitHub

https://github.com/gpac/gpac/issues/1440
github_commit Patch Available

commit 6063b1a011c3 (gpac/gpac)

Patch available: gpac/gpac v0.8.1 (contains commit 6063b1a011c3)

https://github.com/gpac/gpac/commit/6063b1a011c3f80cee25daade18154e15e4c058c

Affected Packages

(1 across 1 ecosystem)
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
gpac—
  • every version up to 1.0.1+dfsg1-2: fixed in 1.0.1+dfsg1-2
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 4× in last 7d / 25× 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 164 total refreshes for this CVE.

  1. 2026-10-05 17:39 UTCEPSS rescore
  2. 2026-10-03 14:22 UTCEPSS rescore
  3. 2026-09-30 14:59 UTCEPSS rescore
  4. 2026-09-30 10:32 UTCEG score recompute
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  6. 2026-09-27 06:45 UTCOSV refresh
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  24. 2026-09-07 15:53 UTCOSV refresh
  25. 2026-09-06 13:44 UTCEPSS rescore
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  1. 2026-09-05 15:24 UTCEPSS rescore
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  12. 2026-08-21 01:09 UTCOSV refresh
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  25. 2026-08-06 13:43 UTCEPSS rescore
  26. 2026-08-05 19:14 UTCEPSS rescore
  27. 2026-08-05 16:41 UTCOSV refresh
  28. 2026-08-04 15:06 UTCEPSS rescore
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  39. 2026-07-23 14:15 UTCEPSS rescore
  40. 2026-07-23 14:15 UTCEPSS rescore
  41. 2026-07-23 01:48 UTCEG score recompute
  42. 2026-07-22 22:33 UTCEG score recompute
  43. 2026-07-22 14:05 UTCEPSS rescore
  44. 2026-07-21 15:22 UTCEPSS rescore
  45. 2026-07-21 15:22 UTCEPSS rescore
  46. 2026-07-20 17:04 UTCEPSS rescore
  47. 2026-07-19 14:59 UTCOSV refresh
  48. 2026-07-19 14:28 UTCEPSS rescore
  49. 2026-07-19 14:28 UTCEPSS rescore
  50. 2026-07-19 02:26 UTCEPSS rescore
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  53. 2026-07-16 16:59 UTCEPSS rescore
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  68. 2026-07-04 06:28 UTCEPSS rescore
  69. 2026-07-02 02:47 UTCOSV refresh
  70. 2026-07-01 15:03 UTCEPSS rescore
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  72. 2026-06-30 23:20 UTCEPSS rescore
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  74. 2026-06-28 14:05 UTCEPSS rescore
  75. 2026-06-28 04:54 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2020-11558?
CVE-2020-11558 is a critical vulnerability published on April 5, 2020. An issue was discovered in libgpac.a in GPAC 0.8.0, as demonstrated by MP4Box. audiosampleentryRead in isomedia/boxcodebase.c does not properly decide when to make gfisomboxdel calls. This leads to various use-after-free outcomes involving mdiaRead, gfisomdeletemovie, and gfisomparsemovieboxes.
When was CVE-2020-11558 disclosed?
CVE-2020-11558 was first published on April 5, 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-2020-11558 actively exploited?
CVE-2020-11558 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1.5% probability of exploitation in the next 30 days (74th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2020-11558?
CVE-2020-11558 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2020-11558?
A fix for CVE-2020-11558 is available: update to the fixed version the vendor names in its advisory.

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