Buffer overflow in Qpdf Project
CVE-2021-36978
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.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.013 (68.7th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 69th percentile — 68.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.013 · newest: 0.013 · change: 0.000
Affected products
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/qpdf/qpdf/issues/492
- github.com/qpdf/qpdf/commit/dc92574c10f3e2516ec6445b88c5d584f40df4e5 (Patch, Third Party Advisory)
- github.com/google/oss-fuzz-vulns/blob/main/vulns/qpdf/OSV-2020-2245.yaml (Third Party Advisory)
- bugs.chromium.org/p/oss-fuzz/issues/detail (Patch, Third Party Advisory)
- lists.debian.org/debian-lts-announce/2023/08/msg00037.html (mailing-list)
- security.gentoo.org/glsa/202401-20 (vendor-advisory)
Frequently asked questions
- What is CVE-2021-36978?
- CVE-2021-36978 is a medium-severity vulnerability in Qpdf Project, classified under Out-of-bounds Write. CVSS score: 5.5/10. Published 2021-07-20.
- How severe is CVE-2021-36978?
- Medium severity. CVSS v3 base score is 5.5 out of 10.
- Is CVE-2021-36978 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.