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CVE-2025-40775— DNS message with invalid TSIG causes an assertion failure

Quick assessment

Affected
ISC BIND 9
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

ISC BIND是ISC开源的一套实现了DNS协议的开源软件。 ISC BIND 9 9.20.0至9.20.8版本和9.21.0至9.21.7版本存在安全漏洞，该漏洞源于TSIG算法字段中的无效值，可能导致断言失败。

CVSS 7.5 · High EPSS 15.22% · P97

Possible ATT&CK Techniques 1 AI

T1498.002 · Reflection Amplification
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I. Basic Information for CVE-2025-40775

Vulnerability Information
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Vulnerability Title
DNS message with invalid TSIG causes an assertion failure
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未定义值处理不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
ISC BIND 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
ISC BIND是ISC开源的一套实现了DNS协议的开源软件。 ISC BIND 9 9.20.0至9.20.8版本和9.21.0至9.21.7版本存在安全漏洞，该漏洞源于TSIG算法字段中的无效值，可能导致断言失败。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
ISC BIND 9 9.20.0 ~ 9.20.8 -

II. Public POCs for CVE-2025-40775

# POC Description Source Link Shenlong Link
1 Demonstrates a real-world zero-trust bypass by exploiting BIND CVE-2025-40775 to disrupt DNS, break secret rotation, and expose static credentials in a cloud-native lab. https://github.com/AlexSvobo/nhi-zero-trust-bypass POC Details
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III. Intelligence Information for CVE-2025-40775

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IV. Related Vulnerabilities

Same product: BIND 9
Same vendor: ISC
Same weakness: CWE-232

V. Comments for CVE-2025-40775

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