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CVE-2021-36978

Date: July 19, 2021

QPDF 9.x through 9.1.1 and 10.x through 10.0.4 has a heap-based buffer overflow in Pl_ASCII85Decoder::write (called from Pl_AES_PDF::flush and Pl_AES_PDF::finish) when a certain downstream write fails.

Language: C++

Severity Score

5.5

Related Resources (11)

Url: https://github.com/qpdf/qpdf/commit/dc92574c10f3e2516ec6445b88c5d584f40df4e5

Url: https://github.com/google/oss-fuzz-vulns/blob/main/vulns/qpdf/OSV-2020-2245.yaml

Url: https://security-tracker.debian.org/tracker/CVE-2021-36978

Url: https://github.com/qpdf/qpdf/issues/492

Url: https://security.gentoo.org/glsa/202401-20

Url: https://lists.debian.org/debian-lts-announce/2023/08/msg00037.html

Url: https://nvd.nist.gov/vuln/detail/CVE-2021-36978

Url: https://access.redhat.com/security/cve/CVE-2021-36978

Url: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=28262

Url: https://people.canonical.com/~ubuntu-security/cve/CVE-2021-36978

Url: https://www.mend.io/vulnerability-database/CVE-2021-36978

Severity Score

5.5

Weakness Type (CWE)

Out-of-bounds Write

CWE-787

CVSS v3.1

Base Score:	5.5
Attack Vector (AV):	LOCAL
Attack Complexity (AC):	LOW
Privileges Required (PR):	NONE
User Interaction (UI):	REQUIRED
Scope (S):	UNCHANGED
Confidentiality (C):	NONE
Integrity (I):	NONE
Availability (A):	HIGH

CVSS v2

Base Score:	4.3
Access Vector (AV):	NETWORK
Access Complexity (AC):	MEDIUM
Authentication (AU):	NONE
Confidentiality (C):	NONE
Integrity (I):	NONE
Availability (A):	PARTIAL
Additional information:

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