CVE-2021-40797

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

1.77% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 77.7% 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:N/AC:L/PR:L/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

2021-09-08 19:11Z5 YR AGO

Last updated

2024-08-04 02:51Z2 YR AGO

Reserved

2021-09-08

Assigning CNA

mitre

Record state

PUBLISHED

Severity

Not rated by the issuing CNA

CNA CVSS vector

Not published by the issuing CNA

Weaknesses

• CWE-772Missing Release of Resource after Effective LifetimeBase
• CWE-770Allocation of Resources Without Limits or ThrottlingBase

Data version

5.1

Document digest

8a39320310738d801eda97e0d0c104f2aa6309c01dfb132cc8ee9152ea42d911

• launchpad.nethttps://launchpad.net/bugs/1942179x_refsource_MISC
• security.openstack.orghttps://security.openstack.org/ossa/OSSA-2021-006.htmlx_refsource_CONFIRM
• www.openwall.com[oss-security] 20210909 [OSSA-2021-006] Neutron: Routes middleware memory leak for nonexistent controllers (CVE-2021-40797)http://www.openwall.com/lists/oss-security/2021/09/09/2mailing-listx_refsource_MLIST