CVE-2021-25216

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

82.99% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 99.6% of scored records. A rank, not a probability.

NVD base score

9.8 (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:H/I:H/A:H

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

2021-04-29 00:55Z5 YR AGO

Last updated

2024-09-16 22:25Z2 YR AGO

Reserved

2021-01-15

Assigning CNA

isc

Record state

PUBLISHED

Severity

High (CVSS 8.1)

CNA CVSS vector

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

Weaknesses

• CWE-125Out-of-bounds ReadBase
• CWE-131Incorrect Calculation of Buffer SizeBase

Data version

5.1

Document digest

7b1ec5b703b1d2e5019a42e1194af9761dc21cbd3e061d79713e9b8b88008e57

• kb.isc.orghttps://kb.isc.org/v1/docs/cve-2021-25215x_refsource_CONFIRM
• www.openwall.com[oss-security] 20210428 ISC discloses three BIND vulnerabilities (CVE-2021-25214, CVE-2021-25215, and CVE-2021-25216)http://www.openwall.com/lists/oss-security/2021/04/29/1mailing-listx_refsource_MLIST
• www.openwall.com[oss-security] 20210429 Re: ISC discloses three BIND vulnerabilities (CVE-2021-25214, CVE-2021-25215, and CVE-2021-25216)http://www.openwall.com/lists/oss-security/2021/04/29/2mailing-listx_refsource_MLIST
• www.openwall.com[oss-security] 20210429 Re: ISC discloses three BIND vulnerabilities (CVE-2021-25214, CVE-2021-25215, and CVE-2021-25216)http://www.openwall.com/lists/oss-security/2021/04/29/3mailing-listx_refsource_MLIST
• www.openwall.com[oss-security] 20210429 Re: ISC discloses three BIND vulnerabilities (CVE-2021-25214, CVE-2021-25215, and CVE-2021-25216)http://www.openwall.com/lists/oss-security/2021/04/29/4mailing-listx_refsource_MLIST
• www.debian.orgDSA-4909https://www.debian.org/security/2021/dsa-4909vendor-advisoryx_refsource_DEBIAN
• lists.debian.org[debian-lts-announce] 20210504 [SECURITY] [DLA 2647-1] bind9 security updatehttps://lists.debian.org/debian-lts-announce/2021/05/msg00001.htmlmailing-listx_refsource_MLIST
• security.netapp.comhttps://security.netapp.com/advisory/ntap-20210521-0006/x_refsource_CONFIRM
• www.zerodayinitiative.comhttps://www.zerodayinitiative.com/advisories/ZDI-21-657/x_refsource_MISC
• cert-portal.siemens.comhttps://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdfx_refsource_CONFIRM