CVE-2021-20257

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

0.37% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 30.0% of scored records. A rank, not a probability.

NVD base score

6.5 (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:C/C:N/I:N/A:H

NVD analysis status

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

Red Hat severity

Low. 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

2022-03-16 14:12Z4 YR AGO

Last updated

2024-08-03 17:37Z2 YR AGO

Reserved

2020-12-17

Assigning CNA

redhat

Record state

PUBLISHED

Severity

Not rated by the issuing CNA

CNA CVSS vector

Not published by the issuing CNA

Weaknesses

• CWE-835Loop with Unreachable Exit Condition ('Infinite Loop')Base

Data version

5.1

Document digest

5bea979451d764127f6e512dad2bacb72f3ab8fee0d435fd4a57a8fea2285793

• www.openwall.comhttps://www.openwall.com/lists/oss-security/2021/02/25/2x_refsource_MISC
• lists.gnu.orghttps://lists.gnu.org/archive/html/qemu-devel/2021-02/msg07428.htmlx_refsource_MISC
• github.comhttps://github.com/qemu/qemu/commit/3de46e6fc489c52c9431a8a832ad8170a7569bd8x_refsource_MISC
• bugzilla.redhat.comhttps://bugzilla.redhat.com/show_bug.cgi?id=1930087x_refsource_MISC
• security.netapp.comhttps://security.netapp.com/advisory/ntap-20220425-0003/x_refsource_CONFIRM
• security.gentoo.orgGLSA-202208-27https://security.gentoo.org/glsa/202208-27vendor-advisoryx_refsource_GENTOO
• lists.debian.org[debian-lts-announce] 20220905 [SECURITY] [DLA 3099-1] qemu security updatehttps://lists.debian.org/debian-lts-announce/2022/09/msg00008.htmlmailing-listx_refsource_MLIST