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CVE-2021-25220— DNS forwarders - cache poisoning vulnerability

Quick assessment

Affected
ISC BIND
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

ISC BIND是美国ISC公司的一套实现了DNS协议的开源软件。 ISC BIND 存在环境问题漏洞，该漏洞源于已经收紧了接受记录到缓存中的规则，以防止如果转发器在配置的范围之外发送记录可能会中毒。

CVSS 6.8 · Medium EPSS 3.36% · P88

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2021-25220

Vulnerability Information
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Vulnerability Title
DNS forwarders - cache poisoning vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
BIND 9.11.0 -> 9.11.36 9.12.0 -> 9.16.26 9.17.0 -> 9.18.0 BIND Supported Preview Editions: 9.11.4-S1 -> 9.11.36-S1 9.16.8-S1 -> 9.16.26-S1 Versions of BIND 9 earlier than those shown - back to 9.1.0, including Supported Preview Editions - are also believed to be affected but have not been tested as they are EOL. The cache could become poisoned with incorrect records leading to queries being made to the wrong servers, which might also result in false information being returned to clients.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
ISC BIND 环境问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
ISC BIND是美国ISC公司的一套实现了DNS协议的开源软件。 ISC BIND 存在环境问题漏洞，该漏洞源于已经收紧了接受记录到缓存中的规则，以防止如果转发器在配置的范围之外发送记录可能会中毒。
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 Open Source Branch 9.11 9.11.0 through versions before 9.11.37 -

II. Public POCs for CVE-2021-25220

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III. Intelligence Information for CVE-2021-25220

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Vendor Advisories for CVE-2021-25220 (3)

Mailing List Discussions for CVE-2021-25220 (5)

Other References for CVE-2021-25220 (2)

Same Patch Batch · ISC · 2022-03-23 · 3 CVEs total

CVE-2022-0635 7.5 HIGH ISC BIND 安全漏洞
CVE-2022-0396 5.3 MEDIUM DoS from specifically crafted TCP packets

IV. Related Vulnerabilities

Same product: BIND
Same vendor: ISC

V. Comments for CVE-2021-25220

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