CVE-2025-407768.6HighCWE-349

CVE-2025-40776: Birthday Attack against Resolvers supporting ECS

ISC · BIND 9

Vendor fix available · Affected: ISC BIND 9 · Exploitation: unlikely (under 1%)

Not in CyberSIXT coverage yet: no article names this CVE. This page shows the public record.

0.2%probability of exploitation in the next 30 days

13th percentile

050100

Higher than 13% of scored CVEs

8.6HighCVSS 3.1

LowMediumHighCrit.

DescriptionCVE.org

A `named` caching resolver that is configured to send ECS (EDNS Client Subnet) options may be vulnerable to a cache-poisoning attack. This issue affects BIND 9 versions 9.11.3-S1 through 9.16.50-S1, 9.18.11-S1 through 9.18.37-S1, and 9.20.9-S1 through 9.20.10-S1.

Affected products1

From the CVE record. A product or version that is not listed is unknown, not unaffected.

ISC · BIND 9from 9.11.3-S1 up to and including 9.16.50-S1; from 9.18.11-S1 up to and including 9.18.37-S1; from 9.20.9-S1 up to and including 9.20.10-S1

On the Atlas

Every published CVE is on the CyberSIXT Atlas, grouped by weakness, vendor and month.

Open the Atlas

Exploitation: Unlikely (under 1%). EPSS under 1%, or no score yet.
CISA KEV: Not listed
Public check: No public nuclei template
Weakness: Acceptance of Extraneous Untrusted Data With Trusted Data · Cryptography
Vendor: ISC
Published: July 2025
Band: Unlikely (under 1%), July 2025

CoverageNo articles yet

No CyberSIXT article names CVE-2025-40776 yet, so there is no coverage timeline, action brief or change log for it. Everything on this page comes from the public CVE record, CISA KEV, EPSS and the nuclei template index. Search the archive or see the CVEs in the news.