CVE-2021-33503

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

3.27% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 87.3% of scored records. A rank, not a probability.

NVD base score

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

NVD CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/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

2021-06-29 10:55Z5 YR AGO

Last updated

2024-08-03 23:50Z2 YR AGO

Reserved

2021-05-21

Assigning CNA

mitre

Record state

PUBLISHED

Severity

Not rated by the issuing CNA

CNA CVSS vector

Not published by the issuing CNA

Weaknesses

• CWE-400Uncontrolled Resource ConsumptionClass
• CWE-835Loop with Unreachable Exit Condition ('Infinite Loop')Base

Data version

5.1

Document digest

3d0230102976e27a9b30103973bb0ed59c858ee60ad14d88564998051fd49f56

• lists.fedoraproject.orgFEDORA-2021-a6bde7ab18https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FMUGWEAUYGGHTPPXT6YBD53WYXQGVV73/vendor-advisoryx_refsource_FEDORA
• lists.fedoraproject.orgFEDORA-2021-9c5f3b8aaehttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6SCV7ZNAHS3E6PBFLJGENCDRDRWRZZ6W/vendor-advisoryx_refsource_FEDORA
• security.gentoo.orgGLSA-202107-36https://security.gentoo.org/glsa/202107-36vendor-advisoryx_refsource_GENTOO
• www.oracle.comhttps://www.oracle.com/security-alerts/cpuoct2021.htmlx_refsource_MISC
• github.comhttps://github.com/advisories/GHSA-q2q7-5pp4-w6pgx_refsource_CONFIRM
• github.comhttps://github.com/urllib3/urllib3/commit/2d4a3fee6de2fa45eb82169361918f759269b4ecx_refsource_CONFIRM