CVE-2021-28561

HIGHNVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2022-05-24. NVD baseline CVSS 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
8.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 3%CVSS: 8.8Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

Acrobat Reader DC versions versions 2021.001.20150 (and earlier), 2020.001.30020 (and earlier) and 2017.011.30194 (and earlier) are affected by a memory corruption vulnerability. An unauthenticated attacker could leverage this vulnerability to achieve arbitrary code execution in the context of the current user. Exploitation of this issue requires user interaction in that a victim must open a malicious file.

CVSS v3
8.8
EG Score
8.8(medium)
EPSS
87.0%
KEV
Not listed

Published

September 2, 2021

Last Modified

November 21, 2024

References (2)

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 11× in last 7d / 43× 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.

  1. 2026-07-16 17:00 UTCEPSS rescore
  2. 2026-07-15 16:55 UTCEPSS rescore
  3. 2026-07-15 16:55 UTCEPSS rescore
  4. 2026-07-15 01:58 UTCEPSS rescore
  5. 2026-07-13 22:27 UTCEPSS rescore
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  7. 2026-07-13 06:10 UTCEPSS rescore
  8. 2026-07-12 05:44 UTCEPSS rescore
  9. 2026-07-12 05:44 UTCEPSS rescore
  10. 2026-07-11 08:25 UTCEPSS rescore
  11. 2026-07-11 08:25 UTCEPSS rescore
  12. 2026-07-09 19:07 UTCEPSS rescore
  13. 2026-07-08 15:12 UTCEPSS rescore
  14. 2026-07-07 13:43 UTCEPSS rescore
  15. 2026-07-06 16:25 UTCEPSS rescore
  16. 2026-07-06 16:25 UTCEPSS rescore
  17. 2026-07-06 02:21 UTCEPSS rescore
  18. 2026-07-06 02:21 UTCEPSS rescore
  19. 2026-07-05 02:28 UTCEPSS rescore
  20. 2026-07-04 06:29 UTCEPSS rescore
  21. 2026-07-04 06:29 UTCEPSS rescore
  22. 2026-07-02 16:57 UTCEPSS rescore
  23. 2026-07-01 15:03 UTCEPSS rescore
  24. 2026-06-30 23:20 UTCEPSS rescore
  25. 2026-06-30 23:20 UTCEPSS rescore
Show 57 more
  1. 2026-06-29 14:04 UTCEPSS rescore
  2. 2026-06-28 04:54 UTCEPSS rescore
  3. 2026-06-28 04:54 UTCEPSS rescore
  4. 2026-06-27 03:06 UTCEPSS rescore
  5. 2026-06-27 03:06 UTCEPSS rescore
  6. 2026-06-25 13:48 UTCEPSS rescore
  7. 2026-06-25 13:48 UTCEPSS rescore
  8. 2026-06-24 14:03 UTCEPSS rescore
  9. 2026-06-24 14:03 UTCEPSS rescore
  10. 2026-06-22 14:24 UTCEPSS rescore
  11. 2026-06-22 14:24 UTCEPSS rescore
  12. 2026-06-21 01:58 UTCEPSS rescore
  13. 2026-06-21 01:58 UTCEPSS rescore
  14. 2026-06-19 19:24 UTCEPSS rescore
  15. 2026-06-19 19:24 UTCEPSS rescore
  16. 2026-06-18 17:51 UTCEPSS rescore
  17. 2026-06-18 17:51 UTCEPSS rescore
  18. 2026-06-17 17:51 UTCEPSS rescore
  19. 2026-06-16 17:51 UTCEPSS rescore
  20. 2026-06-15 17:46 UTCEPSS rescore
  21. 2026-06-14 23:15 UTCEPSS rescore
  22. 2026-06-13 22:58 UTCEPSS rescore
  23. 2026-06-13 22:58 UTCEPSS rescore
  24. 2026-06-12 23:10 UTCEPSS rescore
  25. 2026-06-11 13:58 UTCEPSS rescore
  26. 2026-06-10 22:16 UTCEPSS rescore
  27. 2026-06-10 13:20 UTCEPSS rescore
  28. 2026-06-08 14:15 UTCEPSS rescore
  29. 2026-06-07 15:23 UTCEPSS rescore
  30. 2026-06-07 15:23 UTCEPSS rescore
  31. 2026-06-06 13:46 UTCEPSS rescore
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  34. 2026-06-05 22:45 UTCEPSS rescore
  35. 2026-06-05 22:45 UTCEPSS rescore
  36. 2026-06-05 06:09 UTCEPSS rescore
  37. 2026-06-05 06:09 UTCEPSS rescore
  38. 2026-06-04 13:10 UTCEPSS rescore
  39. 2026-06-04 13:10 UTCEPSS rescore
  40. 2026-06-02 20:11 UTCEPSS rescore
  41. 2026-06-02 20:11 UTCEPSS rescore
  42. 2026-06-02 20:11 UTCEPSS rescore
  43. 2026-06-01 13:50 UTCEPSS rescore
  44. 2026-06-01 13:50 UTCEPSS rescore
  45. 2026-05-31 22:29 UTCEPSS rescore
  46. 2026-05-31 22:29 UTCEPSS rescore
  47. 2026-05-31 00:15 UTCEPSS rescore
  48. 2026-05-29 13:42 UTCEPSS rescore
  49. 2026-05-28 13:43 UTCEPSS rescore
  50. 2026-05-28 13:43 UTCEPSS rescore
  51. 2026-05-27 13:39 UTCEPSS rescore
  52. 2026-05-27 13:39 UTCEPSS rescore
  53. 2026-05-26 13:42 UTCEPSS rescore
  54. 2026-05-26 11:06 UTCEG score recompute
  55. 2026-05-26 11:06 UTCGHSA enrichment
  56. 2026-05-26 07:17 UTCEPSS rescore
  57. 2026-05-26 07:17 UTCEPSS rescore

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2021-28561?
CVE-2021-28561 is a high vulnerability published on September 2, 2021. Acrobat Reader DC versions versions 2021.001.20150 (and earlier), 2020.001.30020 (and earlier) and 2017.011.30194 (and earlier) are affected by a memory corruption vulnerability. An unauthenticated attacker could leverage this vulnerability to achieve arbitrary code execution in the context of the…
When was CVE-2021-28561 disclosed?
CVE-2021-28561 was first published in the National Vulnerability Database on September 2, 2021, 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-2021-28561 actively exploited?
CVE-2021-28561 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 87.0% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2021-28561?
CVE-2021-28561 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2021-28561?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-28561, 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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