CVE-2021-40085

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

1.83% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 77.0% 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:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

NVD analysis status

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

Red Hat severity

Important. 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

2021-08-31 17:32Z5 YR AGO

Last updated

2024-08-04 02:27Z2 YR AGO

Reserved

2021-08-25

Assigning CNA

mitre

Record state

PUBLISHED

Severity

Not rated by the issuing CNA

CNA CVSS vector

Not published by the issuing CNA

Weaknesses

• CWE-20Improper Input ValidationClass

Data version

5.1

Document digest

ce1e35485c8242c77e43030e7e3f9c16ef71429030ac97e1d1a941cb698e19ba

• launchpad.nethttps://launchpad.net/bugs/1939733x_refsource_MISC
• www.openwall.com[oss-security] 20210831 [OSSA-2021-005] Neutron: Arbitrary dnsmasq reconfiguration via extra_dhcp_opts (CVE-2021-40085)http://www.openwall.com/lists/oss-security/2021/08/31/2mailing-listx_refsource_MLIST
• security.openstack.orghttps://security.openstack.org/ossa/OSSA-2021-005.htmlx_refsource_MISC
• lists.debian.org[debian-lts-announce] 20211011 [SECURITY] [DLA 2781-1] neutron security updatehttps://lists.debian.org/debian-lts-announce/2021/10/msg00005.htmlmailing-listx_refsource_MLIST
• www.debian.orgDSA-4983https://www.debian.org/security/2021/dsa-4983vendor-advisoryx_refsource_DEBIAN
• lists.debian.org[debian-lts-announce] 20220526 [SECURITY] [DLA 3027-1] neutron security updatehttps://lists.debian.org/debian-lts-announce/2022/05/msg00038.htmlmailing-listx_refsource_MLIST