A flaw was found in dnsmasq before version 2.83. A heap-based buffer overflow was discovered in the way RRSets are sorted before validating with DNSSEC data. An attacker on the network, who can forge DNS replies such as that they are accepted as valid, could use this flaw to cause a buffer overflow with arbitrary data in a heap memory segment, possibly executing code on the machine. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.
総合評価: CVE-2020-25681 は高リスク（67.1/100）。CVSS 深刻度は高。悪用される可能性が高い（EPSS 81.19%、100 パーセンタイル） 根拠: EPSS 上、短期間での悪用可能性は高い水準です。 推奨対応: 悪用可能性が高いため、影響範囲の確認と修補の優先付けを推奨します。
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 | 81.32% | 81.19% | -0.13% |
| 2 | 2026-06-15 | 45.36% | 81.32% | +35.96% |
| 3 | 2026-03-19 | — | 45.36% | — |
EPSS の全履歴 （全 32 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 |
|---|---|---|---|---|---|---|
| 8.1 | 3.1 | HIGH |
|
2.2 | 5.9 | [email protected] |
| 8.3 | 2.0 | HIGH |
|
8.6 | 8.5 | [email protected] |
| vendor | priority | summary | link |
|---|---|---|---|
alpine
|
— | CVE-2020-25681: 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-2020-25681 |
debian
|
not yet assigned | CVE-2020-25681 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-2020-25681 |
gentoo
|
normal | CVE-2020-25681: 1 GLSA(s) (202101-17), 1 atom(s) (net-dns/dnsmasq); latest impact normal. | https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2020-25681 |
redhat
|
high | — | https://access.redhat.com/security/cve/CVE-2020-25681 |
suse
|
high | CVE-2020-25681 severity important: SUSE including 25 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, …), 64 product×package rows across 53 product lines (Container suse/sles/15.2/virt-launcher, Container suse/sles/15.3/virt-launcher, … (53 product lines)): Fixed 64. | https://www.suse.com/security/cve/CVE-2020-25681/ |
ubuntu
|
medium | CVE-2020-25681 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, not-affected 1. | https://ubuntu.com/security/CVE-2020-25681 |
| 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:*:*:*:*:*:*:* |
| URL | タグ |
|---|---|
| https://bugzilla.redhat.com/show_bug.cgi?id=1881875 | 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.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 |