CVE-2021-25219 | Lame cache can be abused to severely degrade resolver performance

In BIND 9.3.0 -> 9.11.35, 9.12.0 -> 9.16.21, and versions 9.9.3-S1 -> 9.11.35-S1 and 9.16.8-S1 -> 9.16.21-S1 of BIND Supported Preview Edition, as well as release versions 9.17.0 -> 9.17.18 of the BIND 9.17 development branch, exploitation of broken authoritative servers using a flaw in response processing can cause degradation in BIND resolver performance. The way the lame cache is currently designed makes it possible for its internal data structures to grow almost infinitely, which may cause significant delays in client query processing.

公开: 2021-10-27 最后更新: 2026-06-16 分配方: [email protected] 来源: [email protected]

结论预警: CVE-2021-25219 综合评估为中等风险(49.2/100):CVSS 技术影响为中级,利用概率偏高(EPSS 8.00%,百分位 94%) 核心证据: EPSS 显示该漏洞近期被利用的可能性处于高位。 强制指令: 被利用概率偏高—请排查暴露面并优先安排修补。

风险随态势动态变化;本站持续评估并同步更新本页展示内容。

CVE-2021-25219 的 EPSS(利用预测评分)

EPSS 日更估计相对被利用可能性;百分位表示该 CVE 在已评分漏洞中的相对排名(越高表示相对更严重)。

# 日期 旧 EPSS 分数 新 EPSS 分数 变化(新 − 旧)
1 2026-06-23 12.90% 8.00% -4.90%
2 2026-06-15 0.96% 12.90% +11.94%
3 2026-03-20 0.96%

完整 EPSS 历史 (共 31 条)

CVE-2021-25219 的 CVSS 指标

该 CVE 的 CVSS 指标。

底座分 版本 严重度 向量 可利用性 影响 分数来源
5.3 3.1 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L 点击展开
攻击向量 (AV:N)
经互联网或企业内可路由网段即可从远端触达,攻击者不必出现在设备旁。
攻击复杂度 (AC:L)
前置条件清晰,成功路径稳定,不依赖罕见竞态或苛刻环境。
权限要求 (PR:N)
不必事先登录或提权,匿名会话也可能成为跳板。
用户交互 (UI:N)
无需受害者点击链接、放行宏或安装软件,攻击链可自动走完。
作用域 (S:U)
破坏局限在脆弱组件原本的安全权限与信任域之内。
机密性影响 (C:N)
几乎谈不上实质性的敏感数据外泄。
完整性影响 (I:N)
对记录真实性与不可否认性的破坏可忽略。
可用性影响 (A:L)
出现明显延迟、间歇性故障或局部功能不可用,但可用运维手段缓解。
3.9 1.4 [email protected]
5.3 3.1 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L 点击展开
攻击向量 (AV:N)
经互联网或企业内可路由网段即可从远端触达,攻击者不必出现在设备旁。
攻击复杂度 (AC:L)
前置条件清晰,成功路径稳定,不依赖罕见竞态或苛刻环境。
权限要求 (PR:N)
不必事先登录或提权,匿名会话也可能成为跳板。
用户交互 (UI:N)
无需受害者点击链接、放行宏或安装软件,攻击链可自动走完。
作用域 (S:U)
破坏局限在脆弱组件原本的安全权限与信任域之内。
机密性影响 (C:N)
几乎谈不上实质性的敏感数据外泄。
完整性影响 (I:N)
对记录真实性与不可否认性的破坏可忽略。
可用性影响 (A:L)
出现明显延迟、间歇性故障或局部功能不可用,但可用运维手段缓解。
3.9 1.4 [email protected]
5.0 2.0 MEDIUM
AV:N/AC:L/Au:N/C:N/I:N/A:P 点击展开
访问路径 (AV:N)
只要路由可达,即可从远端发起利用。
访问复杂度 (AC:L)
步骤短、路径清晰,复现成本低。
认证 (AU:N)
全程无需有效身份。
机密性影响 (C:N)
对机密性无影响。
完整性影响 (I:N)
对完整性无影响。
可用性影响 (A:P)
可用性受到部分损害。
10.0 2.9 [email protected]

CVE-2021-25219 的弱点枚举

CVE-2021-25219 的 OS 跟踪

vendor priority summary link
alpine medium CVE-2021-25219: 1 source package rows (bind); 97 state rows across 9 repos (3.11-main, 3.12-main, 3.17-main, 3.18-main, 3.19-main, 3.20-main, 3.21-main, 3.22-main, edge-main); fixed 8, open 89. https://security.alpinelinux.org/vuln/CVE-2021-25219
debian not yet assigned CVE-2021-25219 not yet assigned priority: Debian including 1 source packages (bind9), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2021-25219
gentoo low CVE-2021-25219: 1 GLSA(s) (202210-25), 2 atom(s) (net-dns/bind, net-dns/bind-tools); latest impact low. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2021-25219
redhat medium https://access.redhat.com/security/cve/CVE-2021-25219
suse medium CVE-2021-25219 severity moderate: SUSE including 388 source package names (amazon/suse-sles-15-sp1-chost-byos-v20210304-hvm-ssd-x86_64, amazon/suse-sles-15-sp1-chost-byos-v20220127-hvm-ssd-x86_64, …), 1447 product×package rows across 201 product lines (HPE Helion OpenStack 8, Image SLES12-SP5-Azure-BYOS, … (201 product lines)): Fixed 1033, Known Not Affected 362, Known Affected 52. https://www.suse.com/security/cve/CVE-2021-25219/
ubuntu medium CVE-2021-25219 medium priority: Ubuntu including 1 source packages (bind9), 8 status rows across 8 suites (bionic, focal, hirsute, impish, jammy, trusty, upstream, xenial): released 7, needs-triage 1. https://ubuntu.com/security/CVE-2021-25219

CVE-2021-25219 的影响软件 / 配置

厂商 产品 版本 原始 CPE
isc bind >= 9.3.0, < 9.11.36 cpe:2.3:a:isc:bind:*:*:*:*:-:*:*:*
isc bind >= 9.12.0, < 9.16.22 cpe:2.3:a:isc:bind:*:*:*:*:-:*:*:*
isc bind >= 9.17.0, < 9.17.19 cpe:2.3:a:isc:bind:*:*:*:*:-:*:*:*
isc bind 9.9.3 cpe:2.3:a:isc:bind:9.9.3:s1:*:*:supported_preview:*:*:*
isc bind 9.9.12 cpe:2.3:a:isc:bind:9.9.12:s1:*:*:supported_preview:*:*:*
isc bind 9.9.13 cpe:2.3:a:isc:bind:9.9.13:s1:*:*:supported_preview:*:*:*
isc bind 9.10.5 cpe:2.3:a:isc:bind:9.10.5:s1:*:*:supported_preview:*:*:*
isc bind 9.10.7 cpe:2.3:a:isc:bind:9.10.7:s1:*:*:supported_preview:*:*:*
isc bind 9.11.3 cpe:2.3:a:isc:bind:9.11.3:s1:*:*:supported_preview:*:*:*
isc bind 9.11.5 cpe:2.3:a:isc:bind:9.11.5:s3:*:*:supported_preview:*:*:*
isc bind 9.11.5 cpe:2.3:a:isc:bind:9.11.5:s5:*:*:supported_preview:*:*:*
isc bind 9.11.5 cpe:2.3:a:isc:bind:9.11.5:s6:*:*:supported_preview:*:*:*
isc bind 9.11.6 cpe:2.3:a:isc:bind:9.11.6:s1:*:*:supported_preview:*:*:*
isc bind 9.11.7 cpe:2.3:a:isc:bind:9.11.7:s1:*:*:supported_preview:*:*:*
isc bind 9.11.8 cpe:2.3:a:isc:bind:9.11.8:s1:*:*:supported_preview:*:*:*
isc bind 9.11.12 cpe:2.3:a:isc:bind:9.11.12:s1:*:*:supported_preview:*:*:*
isc bind 9.11.21 cpe:2.3:a:isc:bind:9.11.21:s1:*:*:supported_preview:*:*:*
isc bind 9.11.27 cpe:2.3:a:isc:bind:9.11.27:s1:*:*:supported_preview:*:*:*
isc bind 9.11.29 cpe:2.3:a:isc:bind:9.11.29:s1:*:*:supported_preview:*:*:*
isc bind 9.11.35 cpe:2.3:a:isc:bind:9.11.35:s1:*:*:supported_preview:*:*:*
isc bind 9.16.8 cpe:2.3:a:isc:bind:9.16.8:s1:*:*:supported_preview:*:*:*
isc bind 9.16.11 cpe:2.3:a:isc:bind:9.16.11:s1:*:*:supported_preview:*:*:*
isc bind 9.16.13 cpe:2.3:a:isc:bind:9.16.13:s1:*:*:supported_preview:*:*:*
isc bind 9.16.21 cpe:2.3:a:isc:bind:9.16.21:s1:*:*:supported_preview:*:*:*
debian debian_linux 9.0 cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
debian debian_linux 10.0 cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
debian debian_linux 11.0 cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*
fedoraproject fedora 33 cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*
fedoraproject fedora 34 cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*
fedoraproject fedora 35 cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:*
netapp h300s_firmware cpe:2.3:o:netapp:h300s_firmware:-:*:*:*:*:*:*:*
netapp h500s_firmware cpe:2.3:o:netapp:h500s_firmware:-:*:*:*:*:*:*:*
netapp h700s_firmware cpe:2.3:o:netapp:h700s_firmware:-:*:*:*:*:*:*:*
netapp h300e_firmware cpe:2.3:o:netapp:h300e_firmware:-:*:*:*:*:*:*:*
netapp h500e_firmware cpe:2.3:o:netapp:h500e_firmware:-:*:*:*:*:*:*:*
netapp h700e_firmware cpe:2.3:o:netapp:h700e_firmware:-:*:*:*:*:*:*:*
netapp h410s_firmware cpe:2.3:o:netapp:h410s_firmware:-:*:*:*:*:*:*:*
netapp h410c_firmware cpe:2.3:o:netapp:h410c_firmware:-:*:*:*:*:*:*:*
netapp cloud_backup cpe:2.3:a:netapp:cloud_backup:-:*:*:*:*:*:*:*
siemens sinec_infrastructure_network_services < 1.0.1.1 cpe:2.3:a:siemens:sinec_infrastructure_network_services:*:*:*:*:*:*:*:*
oracle http_server 12.2.1.3.0 cpe:2.3:a:oracle:http_server:12.2.1.3.0:*:*:*:*:*:*:*
oracle http_server 12.2.1.4.0 cpe:2.3:a:oracle:http_server:12.2.1.4.0:*:*:*:*:*:*:*
oracle zfs_storage_appliance_kit 8.8 cpe:2.3:a:oracle:zfs_storage_appliance_kit:8.8:*:*:*:*:*:*:*

CVE-2021-25219 的参考链接

URL 标签
https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf Patch Third Party Advisory
https://kb.isc.org/v1/docs/cve-2021-25219 Vendor Advisory
https://lists.debian.org/debian-lts-announce/2021/11/msg00001.html Mailing List Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/EF4NAVRV4H3W4GA3LGGZYUKD3HSJBAVW/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YGV7SA27CTYLGFJSPUM3V36ZWK7WWDI4/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YTKC4E3HUOLYN5IA4EBL4VAQSWG2ZVTX/
https://security.gentoo.org/glsa/202210-25 Third Party Advisory
https://security.netapp.com/advisory/ntap-20211118-0002/ Third Party Advisory
https://www.debian.org/security/2021/dsa-4994 Third Party Advisory
https://www.oracle.com/security-alerts/cpuapr2022.html Third Party Advisory
cvelogic Threat Intelligence