Vulnerability details
CVE-2025-40775
ISC BIND 9
DNS message with invalid TSIG causes an assertion failure
CVSS 3.1
7.5High
Official 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.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 7.5High | 3.1 | CVEProject cvelistV5 (CNA) (isc) | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| ISC | BIND 9 | 9.20.0 ≤ v ≤ 9.20.8 | CVEProject cvelistV5 (CNA) |
| ISC | BIND 9 | 9.21.0 ≤ v ≤ 9.21.7 | CVEProject cvelistV5 (CNA) |
References and advisories
3
Kolun on Telegram @kolunsec
Exploited CVEs, key news and a daily digest
Alerts for this product's next CVEsFollow the product to get new vulnerabilities on Telegram.
Details
- Published
- 2025-05-21
- Last updated
- 2025-05-23
- State
- Published
- Assigner (CNA)
- isc
Exploit prediction (EPSS)
15.31%
Probability of exploitation in 30 days
96.7%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- Yes
- Exploitation
- None
- Technical impact
- Partial
Weaknesses (CWE)
- CWE-232Improper Handling of Undefined Values