A flaw was found in dnsmasq before version 2.83. When getting a reply from a forwarded query, dnsmasq checks in the forward.c:reply_query() if the reply destination address/port is used by the pending forwarded queries. However, it does not use the address/port to retrieve the exact forwarded query, substantially reducing the number of attempts an attacker on the network would have to perform to forge a reply and get it accepted by dnsmasq. This issue contrasts with RFC5452, which specifies a query's attributes that all must be used to match a reply. This flaw allows an attacker to perform a DNS Cache Poisoning attack. If chained with CVE-2020-25685 or CVE-2020-25686, the attack complexity of a successful attack is reduced. The highest threat from this vulnerability is to data integrity.
総合評価: CVE-2020-25684 は中リスク（46/100）。CVSS 深刻度は低。悪用される可能性が高い（EPSS 4.04%、89 パーセンタイル） 推奨対応: 影響資産を整理し、修補計画に組み込んでください。
リスクは変動します。再評価に基づき、本ページの表示内容を更新しています。
EPSS は日次で悪用されやすさの相対度合いを推定します。パーセンタイルは採点済み CVE の中での相対位置（高いほど相対的に深刻）を示します。
| # | 日付 | 旧 EPSS スコア | 新 EPSS スコア | Δ（新 − 旧） |
|---|---|---|---|---|
| 1 | 2026-06-28 | 4.08% | 4.04% | -0.03% |
| 2 | 2026-06-15 | 0.27% | 4.08% | +3.80% |
| 3 | 2025-11-21 | — | 0.27% | — |
EPSS の全履歴 （全 25 件）
この CVE の CVSS 指標。
| ベーススコア | バージョン | 深刻度 | ベクトル | 悪用しやすさ | 影響 | スコアの出典 |
|---|---|---|---|---|---|---|
| 3.7 | 3.1 | LOW |
|
2.2 | 1.4 | [email protected] |
| 4.3 | 2.0 | MEDIUM |
|
8.6 | 2.9 | [email protected] |
| vendor | priority | summary | link |
|---|---|---|---|
alpine
|
— | CVE-2020-25684: 1 source package rows (dnsmasq); 25 state rows across 10 repos (3.10-main, 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 10, open 15. | https://security.alpinelinux.org/vuln/CVE-2020-25684 |
debian
|
not yet assigned | CVE-2020-25684 not yet assigned priority: Debian including 1 source packages (dnsmasq), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. | https://security-tracker.debian.org/tracker/CVE-2020-25684 |
gentoo
|
normal | CVE-2020-25684: 1 GLSA(s) (202101-17), 1 atom(s) (net-dns/dnsmasq); latest impact normal. | https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2020-25684 |
redhat
|
medium | — | https://access.redhat.com/security/cve/CVE-2020-25684 |
suse
|
high | CVE-2020-25684 severity important: SUSE including 27 source package names (0.38.1.5.8.40:dnsmasq-2.78-7.6.1, 0.45.0.8.14.1:dnsmasq-2.78-7.6.1, …), 66 product×package rows across 54 product lines (Container suse/sles/15.2/virt-launcher, Container suse/sles/15.3/virt-launcher, … (54 product lines)): Fixed 66. | https://www.suse.com/security/cve/CVE-2020-25684/ |
ubuntu
|
medium | CVE-2020-25684 medium priority: Ubuntu including 1 source packages (dnsmasq), 15 status rows across 15 suites (bionic, focal, groovy, hirsute, impish, jammy, kinetic, lunar, mantic, noble, oracular, plucky, trusty, upstream, xenial): released 14, ignored 1. | https://ubuntu.com/security/CVE-2020-25684 |
| ベンダー | 製品 | バージョン | 生の CPE |
|---|---|---|---|
| thekelleys | dnsmasq | < 2.83 | cpe:2.3:a:thekelleys:dnsmasq:*:*:*:*:*:*:*:* |
| fedoraproject | fedora | 32 | cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:* |
| fedoraproject | fedora | 33 | cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:* |
| 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:*:*:*:*:*:*:* |
| arista | eos | >= 4.21, < 4.21.14m | cpe:2.3:o:arista:eos:*:*:*:*:*:*:*:* |
| arista | eos | >= 4.22, < 4.22.9m | cpe:2.3:o:arista:eos:*:*:*:*:*:*:*:* |
| arista | eos | >= 4.23, < 4.23.7m | cpe:2.3:o:arista:eos:*:*:*:*:*:*:*:* |
| arista | eos | >= 4.24, < 4.24.5m | cpe:2.3:o:arista:eos:*:*:*:*:*:*:*:* |
| arista | eos | >= 4.25, < 4.25.2f | cpe:2.3:o:arista:eos:*:*:*:*:*:*:*:* |
| URL | タグ |
|---|---|
| https://bugzilla.redhat.com/show_bug.cgi?id=1889686 | Issue Tracking Patch Third Party Advisory |
| https://lists.debian.org/debian-lts-announce/2021/03/msg00027.html | Mailing List Third Party Advisory |
| https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QGB7HL3OWHTLEPSMLDGOMXQKG3KM2QME/ | |
| https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WYW3IR6APUSKOYKL5FT3ACTIHWHGQY32/ | |
| https://security.gentoo.org/glsa/202101-17 | Third Party Advisory |
| https://www.arista.com/en/support/advisories-notices/security-advisories/12135-security-advisory-61 | Third Party Advisory |
| https://www.debian.org/security/2021/dsa-4844 | Third Party Advisory |
| https://www.jsof-tech.com/disclosures/dnspooq/ | Third Party Advisory |
| https://www.kb.cert.org/vuls/id/434904 |