CVE-2021-33657

HIGHNVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2022-04-03. NVD baseline CVSS 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
8.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 2%CVSS: 8.8Exploit: None knownExposed: 0

A fix is available — apply it.

There is a heap overflow problem in video/SDL_pixels.c in SDL (Simple DirectMedia Layer) 2.x to 2.0.18 versions. By crafting a malicious .BMP file, an attacker can cause the application using this library to crash, denial of service or Code execution.

CVSS v3
8.8
EG Score
8.8(medium)
EG Risk
45(Track)
EG Risk 45/100SSVC: 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
Severity88% × 45%
Exploitation2% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
2%
EPSS %ILE
80%
KEV
Not listed

Published

April 1, 2022

Last Modified

November 21, 2024

Advisory Details (4)

Auto-updated Aug 27, 2026
Patch available. Sources: github_commit.
generic

libsdl2: Multiple Vulnerabilities (GLSA 202305-18) — Gentoo security

https://security.gentoo.org/glsa/202305-18
generic

libsdl: Multiple Vulnerabilities (GLSA 202305-17) — Gentoo security

https://security.gentoo.org/glsa/202305-17
generic Patch Available

[SECURITY] [DLA 3314-1] libsdl2 security update

https://lists.debian.org/debian-lts-announce/2023/02/msg00008.html
github_commit

commit 8c91cf7dba51 (libsdl-org/SDL)

Fix landed in libsdl-org/SDL commit 8c91cf7dba51 — awaiting tagged release

https://github.com/libsdl-org/SDL/commit/8c91cf7dba5193f5ce12d06db1336515851c9ee9

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulibsdl1.2-dev (1.2.15+dfsg1-3ubuntu0.1+esm1) @ xenial2026-05-26ubuntu

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

(7 across 5 ecosystems)
Debian:11(2)
PackageVulnerable rangeFixed inDependents
libsdl1.21.2.15+dfsg2-6, 1.2.15+dfsg2-7, 1.2.15+dfsg2-8——
libsdl22.0.14+dfsg2-32.0.14+dfsg2-3+deb11u1—
Debian:12(2)
PackageVulnerable rangeFixed inDependents
libsdl1.2—1.2.15+dfsg2-7—
libsdl2—2.0.20+dfsg-2—
Debian:10(1)
PackageVulnerable rangeFixed inDependents
libsdl22.0.9+dfsg1-12.0.9+dfsg1-1+deb10u1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
libsdl2—2.0.20+dfsg-2—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
libsdl2—2.0.20+dfsg-2—

Weakness Classification(1)

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

All Vendor Advisories

(1)

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 8× in last 7d / 33× 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 174 total refreshes for this CVE.

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

Related CVEs(same product + same CWE)

Frequently asked(5)

What is CVE-2021-33657?
CVE-2021-33657 is a high vulnerability published on April 1, 2022. There is a heap overflow problem in video/SDL_pixels.c in SDL (Simple DirectMedia Layer) 2.x to 2.0.18 versions. By crafting a malicious .BMP file, an attacker can cause the application using this library to crash, denial of service or Code execution.
When was CVE-2021-33657 disclosed?
CVE-2021-33657 was first published in the National Vulnerability Database on April 1, 2022, 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-2021-33657 actively exploited?
CVE-2021-33657 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 2% probability of exploitation in the next 30 days, which ranks it in the top 19.6% of all scored CVEs.
What is the CVSS score of CVE-2021-33657?
CVE-2021-33657 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2021-33657?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-33657, 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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