CVE-2021-3770

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

0.73% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 53.9% of scored records. A rank, not a probability.

NVD base score

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

NVD CVSS vector

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

2021-09-06 00:00Z5 YR AGO

Last updated

2024-08-03 17:09Z2 YR AGO

Reserved

2021-09-05

Assigning CNA

@huntrdev

Record state

PUBLISHED

Severity

High (CVSS 8.6)

CNA CVSS vector

CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

Weaknesses

• CWE-122Heap-based Buffer OverflowVariant
• CWE-787Out-of-bounds WriteBase
• CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')Base

Data version

5.1

Document digest

036f5880a714e55246d0f2630a387c3ebb7ff240eecfd595d04aa7ea88e2456d

• huntr.devhttps://huntr.dev/bounties/016ad2f2-07c1-4d14-a8ce-6eed10729365
• github.comhttps://github.com/vim/vim/commit/b7081e135a16091c93f6f5f7525a5c58fb7ca9f9
• lists.fedoraproject.orgFEDORA-2021-5fa81a2b04https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/J2CJLY3CF55I2ULG2X4ENXLSXAXYW5J4/vendor-advisory
• lists.fedoraproject.orgFEDORA-2021-4a43cbe0b4https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/X4FFQARG3LGREPDZRI4C7ERQL3RJKEWQ/vendor-advisory
• lists.fedoraproject.orgFEDORA-2021-e982f972f2https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZFNTMVZCN4TRTTCAXRLVQ7H2P7FYAIZQ/vendor-advisory
• www.openwall.com[oss-security] 20210930 3 new CVE's in vimhttp://www.openwall.com/lists/oss-security/2021/10/01/1mailing-list
• security.gentoo.orgGLSA-202208-32https://security.gentoo.org/glsa/202208-32vendor-advisory
• security.netapp.comhttps://security.netapp.com/advisory/ntap-20221124-0003/