CVE-2026-11721

Exploitation

Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.

SSVC decision

• ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
• AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
• Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

0.40% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 32.4% 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:H/A:N

NVD analysis status

Undergoing Analysis. NVD last modified this record on 2026-07-22.

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

2026-07-22 14:13Z1 MO AGO

Last updated

2026-07-22 18:52Z1 MO AGO

Reserved

2026-06-09

Assigning CNA

isc

Record state

PUBLISHED

Severity

High (CVSS 7.5)

CNA CVSS vector

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

Weaknesses

• CWE-1284Improper Validation of Specified Quantity in InputBase
• CWE-345Insufficient Verification of Data AuthenticityClass

Data version

5.2

Document digest

f0eaf9808195761661b3405730f37de02cfb8d808e84b448d67f613b135f5b8b

• kb.isc.orgCVE-2026-11721https://kb.isc.org/docs/cve-2026-11721vendor-advisory
• downloads.isc.orghttps://downloads.isc.org/isc/bind9/9.20.26patch
• downloads.isc.orghttps://downloads.isc.org/isc/bind9/9.21.24patch