CVE-2025-8677— Resource exhaustion via malformed DNSKEY handling
Quick assessment
Affected
ISC BIND 9
Exploitation
High exploitation probability; assess promptly
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 9.18.0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、9.18.11-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，该漏洞源于处理特制区域中畸形DNSKEY记录时资源消耗不当，可能导致CPU耗尽。
Possible ATT&CK Techniques 1 AI
T1496 · Resource Hijacking
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I. Basic Information for CVE-2025-8677
Vulnerability Information
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Vulnerability Title
Resource exhaustion via malformed DNSKEY handling
Source: CVE Program / CVE List V5
Vulnerability Description
Querying for records within a specially crafted zone containing certain malformed DNSKEY records can lead to CPU exhaustion.
This issue affects BIND 9 versions 9.18.0 through 9.18.39, 9.20.0 through 9.20.13, 9.21.0 through 9.21.12, 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:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
不对称的资源消耗(放大攻击)
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 9.18.0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、9.18.11-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，该漏洞源于处理特制区域中畸形DNSKEY记录时资源消耗不当，可能导致CPU耗尽。
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
II. Public POCs for CVE-2025-8677
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Same Patch Batch · ISC · 2025-10-22 · 3 CVEs total
| CVE-2025-40778 | 8.6 HIGH | Cache poisoning attacks with unsolicited RRs |
| CVE-2025-40780 | 8.6 HIGH | Cache poisoning due to weak PRNG |
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Same vendor: ISC
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CVE-2026-11721
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Potential memory usage beyond configured limits
Same weakness: CWE-405
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V. Comments for CVE-2025-8677
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