Is CVE-2025-40775 in the CISA KEV catalog?

No. CVE-2025-40775 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2025-40775?

CVE-2025-40775 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2025-40775?

CVE-2025-40775 has an EPSS score of 12.30% (96th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2025-40775?

Upgrade bind9 on debian 13 to 1:9.20.9-1 or later.

CVE & CISA-KEV Catalog

CVE-2025-40775

HIGHEPSS 96th pctl

7.5

CVSS v3

NVD

Description

When an incoming DNS protocol message includes a Transaction Signature (TSIG), BIND always checks it. If the TSIG contains an invalid value in the algorithm field, BIND immediately aborts with an assertion failure. This issue affects BIND 9 versions 9.20.0 through 9.20.8 and 9.21.0 through 9.21.7.

CWE-232

How to fix

Remediation Available

bind9Debian

Fixed in:1:9.20.9-1CVE-2025-40775

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

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

Exploit Intelligence

12.30%probability of exploitation in 30 days

96thpercentile

Very high risk: more likely to be exploited than 96% of all known CVEs.

References

Other references3

Related Vulnerabilities

Other CWE-232 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2023-2968	High	7.5	1.5%	-	-
CVE-2021-34705	Medium	5.3	1.0%	-	-
CVE-2022-22213	Medium	5.9	0.7%	-	-
CVE-2023-39914	High	7.5	0.6%	-	Fix
CVE-2023-39915	High	7.5	0.5%	-	Fix
CVE-2025-20192	High	7.7	0.4%	-	-

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-05-23.