CVE-2023-5217

CRITICALNVD 8.89.0▲
EchelonGraph scoreHIGH confidence

Score elevated to 9.0 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2023-10-02), indicating real-world exploitation has been confirmed by US federal agencies. NVD baseline CVSS 8.8 retained for reference. Confidence: HIGH.

Triggered by: CISA KEV (actively exploited)
Sources: cisa_kev, epss, nvd
Trending — 4 sources updated this weekExploited in the wild
9.0EG
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS PROB: 49%CVSS: 8.8Exploit: cisa kev · ssvc active · epss top5pct · public exploitExposed: 0

A fix is available — apply it.

Heap buffer overflow in vp8 encoding in libvpx in Google Chrome prior to 117.0.5938.132 and libvpx 1.13.1 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page. (Chromium security severity: High)

CVSS v3
8.8
EG Score
9.0(high)
EG Risk
81(Attend)
EG Risk 81/100SSVC: Attend

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
Severity90% × 45%
Exploitation100% × 40%
Automatability0% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
49%
EPSS %ILE
99%
KEV
⚠ Exploited

Published

September 28, 2023

Last Modified

June 17, 2026

Advisory Details (10)

Auto-updated Jun 2, 2026
⚠️ Active exploitation confirmed. No patch confirmed yet.
generic

oss-security - Re: Re: CVE-2023-5217: Heap buffer overflow in vp8 encoding in libvpx

http://www.openwall.com/lists/oss-security/2023/09/29/7
generic

oss-security - Re: CVE-2023-5217: Heap buffer overflow in vp8 encoding in libvpx

http://www.openwall.com/lists/oss-security/2023/09/29/2
generic

oss-security - Re: CVE-2023-5217: Heap buffer overflow in vp8 encoding in libvpx

http://www.openwall.com/lists/oss-security/2023/09/29/14
generic🔴 Active Exploitation

oss-security - Re: CVE-2023-5217: Heap buffer overflow in vp8 encoding in libvpx

http://www.openwall.com/lists/oss-security/2023/09/29/12
generic

oss-security - Re: CVE-2023-5217: Heap buffer overflow in vp8 encoding in libvpx

http://www.openwall.com/lists/oss-security/2023/09/29/11
generic

oss-security - Re: CVE-2023-5217: Heap buffer overflow in vp8 encoding in libvpx

http://www.openwall.com/lists/oss-security/2023/09/29/1
generic🔴 Active Exploitation

oss-security - Re: CVE-2023-5217: Heap buffer overflow in vp8 encoding in libvpx

http://www.openwall.com/lists/oss-security/2023/09/28/6
generic🔴 Active Exploitation

oss-security - CVE-2023-5217: Heap buffer overflow in vp8 encoding in libvpx

http://www.openwall.com/lists/oss-security/2023/09/28/5
generic🔴 Active Exploitation

Full Disclosure: APPLE-SA-10-10-2023-1 iOS 16.7.1 and iPadOS 16.7.1

http://seclists.org/fulldisclosure/2023/Oct/16
generic🔴 Active Exploitation

Full Disclosure: APPLE-SA-2023-10-04-1 iOS 17.0.3 and iPadOS 17.0.3

http://seclists.org/fulldisclosure/2023/Oct/12

Patch Availability(29)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntuvpx-tools (1.12.0-1ubuntu1.2) @ lunar2026-07-26ubuntu
ubuntuvpx-tools (1.5.0-2ubuntu1.1+esm2) @ xenial2026-07-26ubuntu
ubuntuxul-ext-lightning (1:115.3.1+build1-0ubuntu0.22.04.2) @ jammy2026-07-26ubuntu
ubuntuvpx-tools (1.3.0-2ubuntu0.1~esm3) @ trusty2026-07-26ubuntu
ubuntufirefox-mozsymbols (118.0.1+build1-0ubuntu0.20.04.1) @ focal2026-07-26ubuntu
ubuntuvpx-tools (1.7.0-3ubuntu0.18.04.1+esm1) @ bionic2026-07-26ubuntu
redhatlibvpx-0:1.7.0-10.el8_42023-10-09redhat
redhatlibvpx-0:1.9.0-7.el9_22023-10-09redhat
redhatlibvpx-0:1.7.0-10.el8_82023-10-09redhat
redhatlibvpx-0:1.7.0-8.el8_12023-10-09redhat
redhatlibvpx-0:1.7.0-8.el8_22023-10-09redhat
redhatlibvpx-0:1.9.0-7.el9_02023-10-09redhat
redhatlibvpx-0:1.7.0-10.el8_62023-10-09redhat
redhatthunderbird-0:115.3.1-1.el7_92023-10-05redhat
redhatfirefox-0:115.3.1-1.el7_92023-10-05redhat
redhatfirefox-0:115.3.1-1.el9_22023-10-04redhat
redhatthunderbird-0:115.3.1-1.el9_02023-10-04redhat
redhatfirefox-0:115.3.1-1.el8_12023-10-04redhat
redhatthunderbird-0:115.3.1-1.el8_22023-10-04redhat
redhatthunderbird-0:115.3.1-1.el9_22023-10-04redhat
redhatthunderbird-0:115.3.1-1.el8_12023-10-04redhat
redhatfirefox-0:115.3.1-1.el8_22023-10-04redhat
redhatfirefox-0:115.3.1-1.el8_62023-10-04redhat
redhatfirefox-0:115.3.1-1.el9_02023-10-04redhat
redhatthunderbird-0:115.3.1-1.el8_82023-10-04redhat
redhatfirefox-0:115.3.1-1.el8_82023-10-04redhat
redhatthunderbird-0:115.3.1-1.el8_42023-10-04redhat
redhatfirefox-0:115.3.1-1.el8_42023-10-04redhat
redhatthunderbird-0:115.3.1-1.el8_62023-10-04redhat

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

(1 across 1 ecosystem)
npm(1)
PackageVulnerable rangeFixed inDependents
electron—27.0.0-beta.8—

Weakness Classification(1)

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

All Vendor Advisories

(25)

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 42× in last 7d / 209× 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 436 total refreshes for this CVE.

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

Publicly available exploits

(1 reference)

Working exploit code is in the public domain (1 GitHub PoC). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoCUT-Security/cve-2023-5217-poc
    First seen Oct 6, 2023

    A PoC to trigger CVE-2023-5217 from the Browser WebCodecs or MediaRecorder interface.

    Open source ↗

Related CVEs(same vendor + same CWE)

Frequently asked(6)

What is CVE-2023-5217?
CVE-2023-5217 is a critical vulnerability published on September 28, 2023. Heap buffer overflow in vp8 encoding in libvpx in Google Chrome prior to 117.0.5938.132 and libvpx 1.13.1 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page. (Chromium security severity: High)
When was CVE-2023-5217 disclosed?
CVE-2023-5217 was first published in the National Vulnerability Database on September 28, 2023, 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-2023-5217 actively exploited?
Yes. CISA added CVE-2023-5217 to the Known Exploited Vulnerabilities catalog on October 2, 2023, affecting Google Chromium libvpx. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2023-5217?
CVE-2023-5217 has a CVSS v3 base score of 8.8 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.0.
Which products are affected by CVE-2023-5217?
CVE-2023-5217 affects Google Chromium libvpx. The full affected-products list, including version ranges and fixed versions, is shown in the Affected Packages section of this page.
How do I remediate CVE-2023-5217?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-5217, 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

See which npm, PyPI, Go, and Maven packages are affected by CVE-2023-5217

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