CVE-2021-45958

Exploitation

Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.

SSVC decision

Not assessed by CISA

EPSS probability

1.66% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 76.6% 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

No Red Hat rating. Red Hat rates the CVEs that affect its products.

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

2021-12-31 23:52Z4 YR AGO

Last updated

2024-08-04 04:54Z2 YR AGO

Reserved

2021-12-31

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

Data version

5.1

Document digest

4c9d56463be930f8f391d353299a79cfe600a57735dc608db50f5d7d6e6bfa53

• github.comhttps://github.com/google/oss-fuzz-vulns/blob/main/vulns/ujson/OSV-2021-955.yamlx_refsource_MISC
• bugs.chromium.orghttps://bugs.chromium.org/p/oss-fuzz/issues/detail?id=36009x_refsource_MISC
• github.comhttps://github.com/ultrajson/ultrajson/issues/502#issuecomment-1031747284x_refsource_MISC
• github.comhttps://github.com/ultrajson/ultrajson/issues/501x_refsource_MISC
• github.comhttps://github.com/ultrajson/ultrajson/pull/504x_refsource_CONFIRM
• lists.debian.org[debian-lts-announce] 20220226 [SECURITY] [DLA 2929-1] ujson security updatehttps://lists.debian.org/debian-lts-announce/2022/02/msg00023.htmlmailing-listx_refsource_MLIST
• lists.fedoraproject.orgFEDORA-2022-dbf6e00ba8https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CN7W3GOXALINKFUUE7ICQIC2EF5HNKUQ/vendor-advisoryx_refsource_FEDORA
• lists.fedoraproject.orgFEDORA-2022-569b6b45e2https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ULX35TSWLBBIMEH44MUORPXYYRZKEDC6/vendor-advisoryx_refsource_FEDORA
• lists.fedoraproject.orgFEDORA-2022-d1452fd421https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/O6JUWQTJLA2CMG4CJN7DCUVSOXLZIIXL/vendor-advisoryx_refsource_FEDORA
• lists.fedoraproject.orgFEDORA-2022-33e816bc37https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/NAU5N4A7EUK2AMUCOLYDD5ARXAJYZBD2/vendor-advisoryx_refsource_FEDORA