CVE-2025-40775

highpriority · track · 15EPSS 0.153 · 97 %ileexploit · PoCDEEU

grimoire priorityP1 · Urgent

Exploitable?

Public exploit

1 exploit · PoC

Likely / severe?

15.3% (97th) EPSS

CVSS 7.5 · high

Is it mine?

10 products

Check your exposure

Who says so?

3 sources

cnnvd · enisa_euvd · cert_bund

EPSS · scored 2026-10-27

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.

cvss

Technical severity, 0–10. One row per scoring source.

7.5

010

base score 0–10 · higher = more severe · hover a vector to decode

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondary · ENISA EU

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondary · security-officer@isc.orgexploitability 3.9 · impact 3.6

v3.17.1highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:Psecondary · CVSS-BT (t0sche)

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: none · Automatable: yes · Technical Impact: partialcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-232US

exploits (1)

Public proof-of-concept and weaponised exploit code.

AlexSvobo/nhi-zero-trust-bypassDemonstrates 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.PoC · poc_in_github

affected products (10)

Products and version ranges known to be affected.

Internet Systems Consortium BIND <9.20.9all versionscert_bundDE
Internet Systems Consortium BIND <9.21.8all versionscert_bundDE
Open Source Arch Linuxall versionscert_bundDEcpe:/o:archlinux:archlinux:-
SUSE Linuxall versionscert_bundDEcpe:/o:suse:suse_linux:-
SUSE openSUSEall versionscert_bundDEcpe:/o:suse:opensuse:-
Ubuntu Linuxall versionscert_bundDEcpe:/o:canonical:ubuntu_linux:-
Internet Systems Consortium BIND< 9.20.9cert_bundDE
Internet Systems Consortium BIND< 9.21.8cert_bundDE
ISC BIND 9≤ 9.20.0 ≤9.20.8enisa_euvdEU
ISC BIND 9≤ 9.21.0 ≤9.21.7enisa_euvdEU

advisories (1)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2025-1120Internet Systems Consortium BIND: Schwachstelle ermöglicht Denial of ServiceDeutsch2025-05-21csaf · cert_bundDE
Ein entfernter, anonymer Angreifer kann eine Schwachstelle in Internet Systems Consortium BIND ausnutzen, um einen Denial of Service Angriff durchzuführen.

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd cert_bund NVD CVE.org MITRE

published 2025-05-21modified 2026-06-17

references (7)

External citations — patches, advisories, analysis.

scry

Attackers weaponise vulnerabilities like this against internet-exposed services. See what is exposed on your perimeter with a free passive scan.

Free scan