CVE-2025-40775

HIGHNVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2025-05-21. NVD baseline CVSS 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Elevated
7.5
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 12%CVSS: 7.5Exploit: NoneExposed: 0

A fix is available — apply it.

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 v3
7.5
EG Score
7.5(medium)
EPSS
95.8%
KEV
Not listed

Published

May 21, 2025

Last Modified

April 15, 2026

References (3)

Vendor Advisories for CVE-2025-40775(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntudnsutils (1:9.20.4-3ubuntu1.1) @ plucky2026-05-21ubuntu

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Additional Vendor Advisories

(1)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 11× in last 7d / 44× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 115 total refreshes for this CVE.

  1. 2026-07-22 14:07 UTCEPSS rescore
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  21. 2026-07-10 12:22 UTCOSV refresh
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  22. 2026-06-21 21:43 UTCOSV refresh
  23. 2026-06-21 01:59 UTCEPSS rescore
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  25. 2026-06-19 19:25 UTCEPSS rescore
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  27. 2026-06-18 17:52 UTCEPSS rescore
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  45. 2026-06-05 06:10 UTCEPSS rescore
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  47. 2026-06-04 13:12 UTCEPSS rescore
  48. 2026-06-04 13:12 UTCEPSS rescore
  49. 2026-06-03 06:40 UTCOSV refresh
  50. 2026-06-02 20:12 UTCEPSS rescore
  51. 2026-06-01 13:51 UTCEPSS rescore
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  74. 2026-05-22 21:16 UTCEPSS rescore
  75. 2026-05-22 21:16 UTCEPSS rescore

Publicly available exploits

(1 reference)

Working exploit code is in the public domain (1 GitHub PoC). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoCAlexSvobo/nhi-zero-trust-bypass
    First seen May 23, 2025

    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.

    Open source ↗

Frequently asked(5)

What is CVE-2025-40775?
CVE-2025-40775 is a high vulnerability published on May 21, 2025. 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.
When was CVE-2025-40775 disclosed?
CVE-2025-40775 was first published in the National Vulnerability Database on May 21, 2025, with the most recent update on April 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2025-40775 actively exploited?
CVE-2025-40775 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 95.8% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2025-40775?
CVE-2025-40775 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2025-40775?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-40775, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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