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TI-2021-04191 Aliases CVE-2021-21086GHSA-mwr7-fm5x-rqch

Adobe Reader CoolType Arbitrary Stack Manipulation

Priority MEDIUM 42CWE-787Published · Updated

Key facts

Attack vector
Local
Privileges required
None
User interaction
Required
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
No fix listed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-787 and the CVSS impact.

Summary

Acrobat Reader DC versions versions 2020.013.20074 (and earlier), 2020.001.30018 (and earlier) and 2017.011.30188 (and earlier) are affected by an Out-of-bounds Write vulnerability in the CoolType library. 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.

Why it matters now

EPSS 0.04714 91st percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
AdobeAcrobat Readerup to 2020.013.20074; up to 2020.001.30018; up to 2017.011.30188; up to None—No fix listedCNA
  • Acrobat Reader VendorAdobe Affected up to 2020.013.20074; up to 2020.001.30018; up to 2017.011.30188; up to None Fixed in — No fix listed CNA

CPE configurations NVD · 6

CPEVersionsRoleVendor
cpe:2.3:a:adobe:acrobat:*:*:*:*:classic:*:*:*17.011.30056 – 17.011.30188; 20.001.30005 – 20.001.30018VulnerableAdobe
cpe:2.3:a:adobe:acrobat_dc:*:*:*:*:continuous:*:*:*20.006.20042 – 20.013.20074VulnerableAdobe
cpe:2.3:a:adobe:acrobat_reader:*:*:*:*:classic:*:*:*17.011.30059 – 17.011.30188; 20.001.30005 – 20.001.300183VulnerableAdobe
cpe:2.3:a:adobe:acrobat_reader_dc:*:*:*:*:continuous:*:*:*20.006.20042 – 20.013.20074VulnerableAdobe
cpe:2.3:o:apple:macos:-:*:*:*:*:*:*:*not specified by NVDRunning onApple
cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:*not specified by NVDRunning onMicrosoft
  • cpe:2.3:a:adobe:acrobat:*:*:*:*:classic:*:*:* Versions 17.011.30056 – 17.011.30188; 20.001.30005 – 20.001.30018 Vulnerable ·Adobe
  • cpe:2.3:a:adobe:acrobat_dc:*:*:*:*:continuous:*:*:* Versions 20.006.20042 – 20.013.20074 Vulnerable ·Adobe
  • cpe:2.3:a:adobe:acrobat_reader:*:*:*:*:classic:*:*:* Versions 17.011.30059 – 17.011.30188; 20.001.30005 – 20.001.300183 Vulnerable ·Adobe
  • cpe:2.3:a:adobe:acrobat_reader_dc:*:*:*:*:continuous:*:*:* Versions 20.006.20042 – 20.013.20074 Vulnerable ·Adobe
  • cpe:2.3:o:apple:macos:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Apple
  • cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Microsoft

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-21086
  2. 2026-10-03 Alias added: GHSA-mwr7-fm5x-rqch

References

Advisory 1

  • TI-2014-00524 Adobe Reader and Acrobat 10.x before 10.1.11 and 11.x before 11.0.08 on Windows allow… KEVCVSS 3.1CRITICAL 9.8
  • TI-2013-02915 Adobe Reader and Acrobat 9.x before 9.5.5, 10.x before 10.1.7, and 11.x before 11.0.03… KEVCVSS 3.1CRITICAL 9.8
  • TI-2013-02389 Integer overflow in Adobe Reader and Acrobat 9.x before 9.5.5, 10.x before 10.1.7, and… KEVCVSS 3.1CRITICAL 9.8
  • TI-2011-02156 Unspecified vulnerability in the U3D component in Adobe Reader and Acrobat 10.1.1 and… KEVCVSS 3.1CRITICAL 9.8
  • TI-2021-09626 Adobe Acrobat Reader use after free vulnerability could lead to arbitrary code execution KEVCVSS 3.1HIGH 8.8
  • TI-2021-04123 Acrobat Reader DC Heap-based Buffer Overflow Vulnerability Could Lead To Arbitrary Code Execution KEVCVSS 3.1HIGH 8.8
See all 1413 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences