CVE-2021-25220— DNS forwarders - cache poisoning vulnerability
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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: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:N/I:H/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
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
II. Public POCs for CVE-2021-25220
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Advisory · 1
- https://security.gentoo.org/glsa/202210-25vendor-advisory
- https://nvd.nist.gov/vuln/detail/CVE-2021-25220
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 vendor: ISC
- CVE-2026-5950
Unbounded resend loop in BIND 9 resolver - CVE-2026-5947
SIG(0) validation during query flood may lead to undefined b - CVE-2026-5946
Invalid handling of CLASS != IN - CVE-2026-3593
Heap use-after-free vulnerability in BIND 9 DNS-over-HTTPS i - CVE-2026-3592
Amplification vulnerabilities via self-pointed glue records
V. Comments for CVE-2021-25220
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