CVE-2023-1999

MEDIUMNVD 5.35.3—
EchelonGraph scoreMEDIUM confidence

Score 5.3 from GitHub Security Advisory (severity: HIGH) published 2023-06-20. NVD baseline CVSS 5.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
5.3
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 1%CVSS: 5.3Exploit: NoneExposed: 0

A fix is available — apply it.

There exists a use after free/double free in libwebp. An attacker can use the ApplyFiltersAndEncode() function and loop through to free best.bw and assign best = trial pointer. The second loop will then return 0 because of an Out of memory error in VP8 encoder, the pointer is still assigned to trial and the AddressSanitizer will attempt a double free.

CVSS v3
5.3
EG Score
5.3(medium)
EG Risk
24(Track)
EG Risk 24/100SSVC: 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
Severity53% × 45%
Exploitation1% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
57.6%
KEV
Not listed

Published

June 20, 2023

Last Modified

February 13, 2025

References (4)

Patch Availability(26)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulibwebpdemux2 (1.2.4-0.1ubuntu0.23.04.1) @ lunar2026-05-24ubuntu
ubuntulibwebpmux1 (0.4.4-1ubuntu0.1~esm2) @ xenial2026-05-24ubuntu
redhatlibwebp-0:0.3.0-11.el72023-05-02redhat
redhatlibwebp-0:1.2.0-6.el9_12023-05-02redhat
redhatlibwebp-0:1.0.0-7.el8_22023-05-02redhat
redhatlibwebp-0:1.2.0-5.el9_02023-05-02redhat
redhatlibwebp-0:1.0.0-7.el8_42023-05-02redhat
redhatlibwebp-0:1.0.0-7.el8_62023-05-02redhat
redhatlibwebp-0:1.0.0-8.el8_72023-05-02redhat
redhatlibwebp-0:1.0.0-5.2.el8_12023-05-02redhat
redhatthunderbird-0:102.10.0-2.el8_42023-04-17redhat
redhatthunderbird-0:102.10.0-2.el8_62023-04-17redhat
redhatthunderbird-0:102.10.0-2.el9_12023-04-17redhat
redhatthunderbird-0:102.10.0-2.el8_22023-04-17redhat
redhatthunderbird-0:102.10.0-2.el8_12023-04-17redhat
redhatthunderbird-0:102.10.0-2.el9_02023-04-17redhat
redhatthunderbird-0:102.10.0-2.el7_92023-04-17redhat
redhatthunderbird-0:102.10.0-2.el8_72023-04-17redhat
redhatfirefox-0:102.10.0-1.el9_02023-04-14redhat
redhatfirefox-0:102.10.0-1.el8_62023-04-14redhat
redhatfirefox-0:102.10.0-1.el8_42023-04-14redhat
redhatfirefox-0:102.10.0-1.el8_12023-04-14redhat
redhatfirefox-0:102.10.0-1.el9_12023-04-14redhat
redhatfirefox-0:102.10.0-1.el7_92023-04-14redhat
redhatfirefox-0:102.10.0-1.el8_72023-04-14redhat
redhatfirefox-0:102.10.0-1.el8_22023-04-14redhat

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.

Weakness Classification(2)

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 13× in last 7d / 50× 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. 2026-07-23 14:16 UTCEPSS rescore
  2. 2026-07-23 14:16 UTCEPSS rescore
  3. 2026-07-23 02:18 UTCEG score recompute
  4. 2026-07-22 23:05 UTCEG score recompute
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  16. 2026-07-15 17:49 UTCOSV refresh
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  1. 2026-07-11 08:25 UTCEPSS rescore
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  18. 2026-06-27 18:04 UTCOSV refresh
  19. 2026-06-27 03:07 UTCEPSS rescore
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  22. 2026-06-24 14:03 UTCEPSS rescore
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  24. 2026-06-23 21:31 UTCEPSS rescore
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  26. 2026-06-22 14:24 UTCEPSS rescore
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  43. 2026-06-13 22:59 UTCEPSS rescore
  44. 2026-06-12 23:10 UTCEPSS rescore
  45. 2026-06-11 13:59 UTCEPSS rescore
  46. 2026-06-11 13:58 UTCEPSS rescore
  47. 2026-06-10 22:17 UTCEPSS rescore
  48. 2026-06-10 13:21 UTCEPSS rescore
  49. 2026-06-10 13:21 UTCEPSS rescore
  50. 2026-06-10 04:47 UTCOSV refresh
  51. 2026-06-08 14:15 UTCEPSS rescore
  52. 2026-06-08 14:15 UTCEPSS rescore
  53. 2026-06-07 15:23 UTCEPSS rescore
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  74. 2026-05-29 13:43 UTCEPSS rescore
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Frequently asked(5)

What is CVE-2023-1999?
CVE-2023-1999 is a medium vulnerability published on June 20, 2023. There exists a use after free/double free in libwebp. An attacker can use the ApplyFiltersAndEncode() function and loop through to free best.bw and assign best = trial pointer. The second loop will then return 0 because of an Out of memory error in VP8 encoder, the pointer is still assigned to…
When was CVE-2023-1999 disclosed?
CVE-2023-1999 was first published in the National Vulnerability Database on June 20, 2023, with the most recent update on February 13, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2023-1999 actively exploited?
CVE-2023-1999 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 57.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2023-1999?
CVE-2023-1999 has a CVSS v3 base score of 5.3 (NVD).
How do I remediate CVE-2023-1999?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-1999, 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.

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