CVE-2021-36978

Exploitation

Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.

SSVC decision

• ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
• AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
• Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

1.27% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 69.4% of scored records. A rank, not a probability.

NVD base score

5.5 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

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

NVD analysis status

Modified. NVD last modified this record on 2026-06-17.

Red Hat severity

Moderate. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2021-07-20 00:00Z5 YR AGO

Last updated

2024-10-15 17:14Z2 YR AGO

Reserved

2021-07-20

Assigning CNA

mitre

Record state

PUBLISHED

Severity

Not rated by the issuing CNA

CNA CVSS vector

Not published by the issuing CNA

Weaknesses

• CWE-787Out-of-bounds WriteBase
• CWE-119Improper Restriction of Operations within the Bounds of a Memory BufferClass

Data version

5.1

Document digest

6fc30a14acae66eabe7058d2bd2861d932e3f17cc5eb8e94457b92123b2370b2

• github.comhttps://github.com/qpdf/qpdf/issues/492
• github.comhttps://github.com/qpdf/qpdf/commit/dc92574c10f3e2516ec6445b88c5d584f40df4e5
• github.comhttps://github.com/google/oss-fuzz-vulns/blob/main/vulns/qpdf/OSV-2020-2245.yaml
• bugs.chromium.orghttps://bugs.chromium.org/p/oss-fuzz/issues/detail?id=28262
• lists.debian.org[debian-lts-announce] 20230829 [SECURITY] [DLA 3548-1] qpdf security updatehttps://lists.debian.org/debian-lts-announce/2023/08/msg00037.htmlmailing-list
• security.gentoo.orgGLSA-202401-20https://security.gentoo.org/glsa/202401-20vendor-advisory