CVE-2021-21057 - CVE House
Back to Database
Status published Medium CVE-2021-21057

Acrobat Reader DC Invalid Memory Read Due To An Uninitialized Pointer

Vulnerability Description

Acrobat Reader DC versions versions 2020.013.20074 (and earlier), 2020.001.30018 (and earlier) and 2017.011.30188 (and earlier) are affected by a null pointer dereference vulnerability when parsing a specially crafted PDF file. An unauthenticated attacker could leverage this vulnerability to achieve 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.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

THREAT MONITOR

Am I Vulnerable?

Launch our assessment wizard to check if your infrastructure is exposed to • CVE-2021-21057

Credits & Attribution

No credits recorded in the NVD database.

References

More from Adobe

View All →
CVE-2025-64899
Acrobat Reader | Out-of-bounds Read (CWE-125)
High 7.8
CVE-2025-64898
ColdFusion | Insufficiently Protected Credentials (CWE-522)
Medium 5.3
CVE-2025-64897
ColdFusion | Improper Access Control (CWE-284)
Medium 5.6
CVE-2025-64896
Creative Cloud Desktop | Creation of Temporary File in Directory with Incorrect Permissions (CWE-379)
Medium 5.5
CVE-2025-64894
DNG SDK | Integer Overflow or Wraparound (CWE-190)
Medium 5.5

Affected Vendor

Affected Software

Acrobat Reader
Vulnerable Versions:
unspecified

Timeline

Official Publish: February 11th, 2021
Last Modified: September 17th, 2024
Added to House: July 21st, 2026

CVSS Vectors

V3: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H

Weaknesses (CWE)

CWE-476

MITRE ATT&CK TTPs

T1499 Endpoint Denial of Service
Impact
T1499.004 Application or System Exploitation
Impact
T1489 Service Stop
Impact
T1203 Exploitation for Client Execution
Execution
T1190 Exploit Public-Facing Application
Initial Access