Adobe Acrobat Reader DC Null Pointer Dereference Could Lead To Application Denial-of-Service
Priority LOW 29CWE-476Published · Updated
Key facts
- Attack vector
- Local
- Privileges required
- None
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-476.
Summary
Acrobat Reader DC versions 2021.005.20060 (and earlier), 2020.004.30006 (and earlier) and 2017.011.30199 (and earlier) are affected by a Null pointer dereference vulnerability. An unauthenticated attacker could leverage this vulnerability to achieve an application denial-of-service 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 0.01943 80th 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
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Adobe | Acrobat Reader | up to DC 2021 July; up to 20.0-Classic 2021 July; up to 17.0-Classic 2021 July; up to None | — | No fix listed | CNA |
- Acrobat Reader VendorAdobe Affected up to DC 2021 July; up to 20.0-Classic 2021 July; up to 17.0-Classic 2021 July; up to None Fixed in — No fix listed CNA
CPE configurations NVD · 10
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:adobe:acrobat:*:*:*:*:classic:*:*:* | 20.001.30005 – 20.004.30006 | Vulnerable | Adobe |
| cpe:2.3:a:adobe:acrobat_reader:*:*:*:*:classic:*:*:* | 20.001.30005 – 20.004.30006 | Vulnerable | Adobe |
| cpe:2.3:o:apple:macos:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Apple |
| cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Microsoft |
| cpe:2.3:a:adobe:acrobat_dc:*:*:*:*:continuous:*:*:* | 15.008.20082 – 21.005.20058 | Vulnerable | Adobe |
| cpe:2.3:a:adobe:acrobat_reader_dc:*:*:*:*:continuous:*:*:* | 15.008.20082 – 21.005.20058 | Vulnerable | Adobe |
| cpe:2.3:a:adobe:acrobat_dc:*:*:*:*:continuous:*:*:* | 15.008.20082 – 21.005.20060 | Vulnerable | Adobe |
| cpe:2.3:a:adobe:acrobat_reader_dc:*:*:*:*:continuous:*:*:* | 15.008.20082 – 21.005.20060 | Vulnerable | Adobe |
| cpe:2.3:a:adobe:acrobat:*:*:*:*:classic:*:*:* | 17.011.30059 – 17.011.30199 | Vulnerable | Adobe |
| cpe:2.3:a:adobe:acrobat_reader:*:*:*:*:classic:*:*:* | 17.011.30059 – 17.011.30199 | Vulnerable | Adobe |
- cpe:2.3:a:adobe:acrobat:*:*:*:*:classic:*:*:* Versions 20.001.30005 – 20.004.30006 Vulnerable ·Adobe
- cpe:2.3:a:adobe:acrobat_reader:*:*:*:*:classic:*:*:* Versions 20.001.30005 – 20.004.30006 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
- cpe:2.3:a:adobe:acrobat_dc:*:*:*:*:continuous:*:*:* Versions 15.008.20082 – 21.005.20058 Vulnerable ·Adobe
- cpe:2.3:a:adobe:acrobat_reader_dc:*:*:*:*:continuous:*:*:* Versions 15.008.20082 – 21.005.20058 Vulnerable ·Adobe
- cpe:2.3:a:adobe:acrobat_dc:*:*:*:*:continuous:*:*:* Versions 15.008.20082 – 21.005.20060 Vulnerable ·Adobe
- cpe:2.3:a:adobe:acrobat_reader_dc:*:*:*:*:continuous:*:*:* Versions 15.008.20082 – 21.005.20060 Vulnerable ·Adobe
- cpe:2.3:a:adobe:acrobat:*:*:*:*:classic:*:*:* Versions 17.011.30059 – 17.011.30199 Vulnerable ·Adobe
- cpe:2.3:a:adobe:acrobat_reader:*:*:*:*:classic:*:*:* Versions 17.011.30059 – 17.011.30199 Vulnerable ·Adobe
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2021-39849
- 2026-10-03 Alias added: GHSA-2fpx-8pwq-8g84
References
More Adobe Acrobat vulnerabilities
- 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
Sources
- CVE-2021-39849 · CVE Program
- CVE-2021-39849 · NVD
- FIRST EPSS
- GHSA-2fpx-8pwq-8g84 · GitHub Advisory Database · CC BY 4.0
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