SecuriTricks - CVE-2025-40780

Description

In specific circumstances, due to a weakness in the Pseudo Random Number Generator (PRNG) that is used, it is possible for an attacker to predict the source port and query ID that BIND will use. This issue affects BIND 9 versions 9.16.0 through 9.16.50, 9.18.0 through 9.18.39, 9.20.0 through 9.20.13, 9.21.0 through 9.21.12, 9.16.8-S1 through 9.16.50-S1, 9.18.11-S1 through 9.18.39-S1, and 9.20.9-S1 through 9.20.13-S1.

Product(s) Impacted

Vendor	Product	Versions
Isc	Bind	9.16.0-9.16.50, 9.18.0-9.18.39, 9.20.0-9.20.13, 9.21.0-9.21.12, 9.16.8-S1-9.16.50-S1, 9.18.11-S1-9.18.39-S1, 9.20.9-S1-9.20.13-S1

Weaknesses

Common security weaknesses mapped to this vulnerability.

CWE-341

Predictable from Observable State

A number or object is predictable based on observations that the attacker can make about the state of the system or network, such as time, process ID, etc.

*CPE(s)

Affected systems and software identified for this CVE.

Type	Vendor	Product	Version	Update	Edition	Language	Software Edition	Target Software	Target Hardware	Other Information
a	isc	bind	9.16.0-9.16.50	/	/	/	/	/	/	/
a	isc	bind	9.18.0-9.18.39	/	/	/	/	/	/	/
a	isc	bind	9.20.0-9.20.13	/	/	/	/	/	/	/
a	isc	bind	9.21.0-9.21.12	/	/	/	/	/	/	/
a	isc	bind	9.16.8-S1-9.16.50-S1	/	/	/	/	/	/	/
a	isc	bind	9.18.11-S1-9.18.39-S1	/	/	/	/	/	/	/
a	isc	bind	9.20.9-S1-9.20.13-S1	/	/	/	/	/	/	/

References

https://kb.isc.org/docs/cve-2025-40780

CVSS Score

8.6 / 10

CVSS Data - 3.1

Attack Vector: NETWORK
Attack Complexity: LOW
Privileges Required: NONE
Scope: CHANGED
Confidentiality Impact: NONE
Integrity Impact: HIGH
Availability Impact: NONE

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

View Vector String

Timeline

Published: Oct. 22, 2025, 4:15 p.m.
Last Modified: Oct. 22, 2025, 9:12 p.m.

Status : Awaiting Analysis

CVE has been recently published to the CVE List and has been received by the NVD.

More info

Source

security-officer@isc.org

CVE-2025-40780