ISC BIND up to 9.21.12 Pseudo Random Number Generator predictable state

CVSS Meta Temp Score
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CTI Interest Score
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6.1$5k-$25k0.00

Summaryinfo

A vulnerability, which was classified as problematic, was found in ISC BIND up to 9.21.12. Affected is an unknown function of the component Pseudo Random Number Generator. The manipulation results in predictable state. This vulnerability is cataloged as CVE-2025-40780. The attack may be launched remotely. There is no exploit available.

Detailsinfo

A vulnerability, which was classified as problematic, was found in ISC BIND up to 9.21.12. Affected is some unknown functionality of the component Pseudo Random Number Generator. The manipulation with an unknown input leads to a predictable state vulnerability. CWE is classifying the issue as CWE-341. 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. This is going to have an impact on integrity. CVE summarizes:

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.

The advisory is available at kb.isc.org. This vulnerability is traded as CVE-2025-40780 since 04/16/2025. The exploitability is told to be difficult. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. The technical details are unknown and an exploit is not available. The structure of the vulnerability defines a possible price range of USD $5k-$25k at the moment (estimation calculated on 02/02/2026). This vulnerability is assigned to T1600.001 by the MITRE ATT&CK project.

The vulnerability scanner Nessus provides a plugin with the ID 271258 (Ubuntu 22.04 LTS / 24.04 LTS / 25.04 / 25.10 : Bind vulnerabilities (USN-7836-1)), which helps to determine the existence of the flaw in a target environment.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the databases at Tenable (271258) and CERT Bund (WID-SEC-2025-2392). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Affected

  • Debian Linux
  • Amazon Linux 2
  • Red Hat Enterprise Linux
  • Fedora Linux
  • Ubuntu Linux
  • SUSE Linux
  • Oracle Linux
  • IBM QRadar SIEM
  • SUSE openSUSE
  • RESF Rocky Linux
  • F5 BIG-IP
  • Internet Systems Consortium BIND
  • Dell NetWorker

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.1
VulDB Meta Temp Score: 6.1

VulDB Base Score: 3.7
VulDB Temp Score: 3.7
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 8.6
CNA Vector (isc): 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Predictable state
CWE: CWE-341 / CWE-200 / CWE-284
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 271258
Nessus Name: Ubuntu 22.04 LTS / 24.04 LTS / 25.04 / 25.10 : Bind vulnerabilities (USN-7836-1)

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Timelineinfo

04/16/2025 CVE reserved
10/22/2025 +189 days Advisory disclosed
10/22/2025 +0 days VulDB entry created
02/02/2026 +103 days VulDB entry last update

Sourcesinfo

Vendor: isc.org

Advisory: kb.isc.org
Status: Confirmed

CVE: CVE-2025-40780 (🔒)
GCVE (CVE): GCVE-0-2025-40780
GCVE (VulDB): GCVE-100-329394
CERT Bund: WID-SEC-2025-2392 - Internet Systems Consortium BIND: Mehrere Schwachstellen

Entryinfo

Created: 10/22/2025 18:07
Updated: 02/02/2026 11:04
Changes: 10/22/2025 18:07 (62), 10/24/2025 05:51 (2), 10/27/2025 08:57 (7), 11/05/2025 15:31 (1), 11/07/2025 13:06 (1), 11/19/2025 12:25 (1), 01/07/2026 12:59 (1), 02/02/2026 11:04 (1)
Complete: 🔍
Cache ID: 216::103

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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