CVE-2021-36978
MEDIUM
5.5
CVSS Score
Published: July 20, 2021 at 12:00 AM UTC
Updated: June 17, 2026 at 03:59 AM UTC
1 product affected across 1 vendorQpdf
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Severity
MEDIUM5.5
Exploit prediction
EPSS 1%
SSVC
No known exploit
Description
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.
Affected
Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.
10.0.0 ≤ v ≤ 10.0.49.0.0 ≤ v ≤ 9.1.1
Remediation
No guide yetNo remediation guidance has been written for this CVE yet. What the record does show:
References (6)
PatchThird Party Advisory
Source: [email protected]
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=28262Third Party Advisory
Source: [email protected]
https://github.com/google/oss-fuzz-vulns/blob/main/vulns/qpdf/OSV-2020-2245.yamlPatchThird Party Advisory
Source: [email protected]
https://github.com/qpdf/qpdf/commit/dc92574c10f3e2516ec6445b88c5d584f40df4e5SSVC — Action Prioritization
SSVCNo known exploitNot automatablePartial impact
SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.
CVSS
- Attack Vector
- LOCAL
- Complexity
- LOW
- Privileges
- NONE
- User Interaction
- REQUIRED
- Scope
- UNCHANGED
- Confidentiality
- NONE
- Integrity
- NONE
- Availability
- HIGH
Vector?
Quick Info
StatusMODIFIED
CWE
CWE-787
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