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CVE-2025-40778— Cache poisoning attacks with unsolicited RRs

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 9是ISC组织的一个域名系统软件。 ISC BIND 9 9.11.0版本至9.16.50版本、9.18.0版本至9.18.39版本、9.20.0版本至9.20.13版本、9.21.0版本至9.21.12版本、9.11.3-S1版本至9.16.50-S1版本、9.18.11-S1版本至9.18.39-S1版本和9.20.9-S1版本至9.20.13-S1版本存在安全漏洞，该漏洞源于接受应答记录时过于宽松，可能导致缓存中注入伪造数据。

CVSS 8.6 · High EPSS 0.66% · P49
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I. Basic Information for CVE-2025-40778

Vulnerability Information
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Vulnerability Title
Cache poisoning attacks with unsolicited RRs
Source: CVE Program / CVE List V5
Vulnerability Description
Under certain circumstances, BIND is too lenient when accepting records from answers, allowing an attacker to inject forged data into the cache. This issue affects BIND 9 versions 9.11.0 through 9.16.50, 9.18.0 through 9.18.39, 9.20.0 through 9.20.13, 9.21.0 through 9.21.12, 9.11.3-S1 through 9.16.50-S1, 9.18.11-S1 through 9.18.39-S1, and 9.20.9-S1 through 9.20.13-S1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在可信数据中接受外来的不可信数据
Source: CVE Program / CVE List V5
Vulnerability Title
ISC BIND 9 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
ISC BIND 9是ISC组织的一个域名系统软件。 ISC BIND 9 9.11.0版本至9.16.50版本、9.18.0版本至9.18.39版本、9.20.0版本至9.20.13版本、9.21.0版本至9.21.12版本、9.11.3-S1版本至9.16.50-S1版本、9.18.11-S1版本至9.18.39-S1版本和9.20.9-S1版本至9.20.13-S1版本存在安全漏洞，该漏洞源于接受应答记录时过于宽松，可能导致缓存中注入伪造数据。
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 9.11.0 ~ 9.16.50 -

II. Public POCs for CVE-2025-40778

# POC Description Source Link Shenlong Link
1 POC CVE-2025-40778: Cache Poisoning BIND 9 👾 https://github.com/nehkark/CVE-2025-40778 POC Details
2 Proof of Concept for CVE-2025-40778: BIND 9 DNS Cache Poisoning via unsolicited Additional Section records. https://github.com/sirbuvladste/BIND-9-Cache-Poisoning-PoC---CVE-2025-40778 POC Details
3 Forensic triage of DNS cache poisoning in legacy hardware. Includes PCAP analysis of 839-byte unsolicited record injections, CVE-2025-40778 mapping, and remediation via hardened Unbound (DoT) on Arch Linux. https://github.com/nicholasC03/DNS-Poisoning-Triage-Lab POC Details
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III. Intelligence Information for CVE-2025-40778

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Same Patch Batch · ISC · 2025-10-22 · 3 CVEs total

CVE-2025-40780 8.6 HIGH Cache poisoning due to weak PRNG
CVE-2025-8677 7.5 HIGH Resource exhaustion via malformed DNSKEY handling

IV. Related Vulnerabilities

Same product: BIND 9
Same vendor: ISC
Same weakness: CWE-349

V. Comments for CVE-2025-40778

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