GHSA-59qg-grp7-5r73 · 深刻度： medium · エコシステム： go — Weave Net clusters susceptible to MitM attacks via IPv6 rogue router advertisements
In Weave Net before version 2.6.3, an attacker able to run a process as root in a container is able to respond to DNS requests from the host and thereby insert themselves as a fake service. In a cluster with an IPv4 internal network, if IPv6 is not totally disabled on the host (via ipv6.disable=1 on the kernel cmdline), it will be either unconfigured or configured on some interfaces, but it's pretty likely that ipv6 forwarding is disabled, ie /proc/sys/net/ipv6/conf//forwarding == 0. Also by default, /proc/sys/net/ipv6/conf//accept_ra == 1. The combination of these 2 sysctls means that the host accepts router advertisements and configure the IPv6 stack using them. By sending rogue router advertisements, an attacker can reconfigure the host to redirect part or all of the IPv6 traffic of the host to the attacker controlled container. Even if there was no IPv6 traffic before, if the DNS returns A (IPv4) and AAAA (IPv6) records, many HTTP libraries will try to connect via IPv6 first then fallback to IPv4, giving an opportunity to the attacker to respond. If by chance you also have on the host a vulnerability like last year's RCE in apt (CVE-2019-3462), you can now escalate to the host. Weave Net version 2.6.3 disables the accept_ra option on the veth devices that it creates.
総合評価: CVE-2020-11091 は中リスク（42.7/100）。CVSS 深刻度は中。悪用される可能性が高い（EPSS 0.86%、54 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 | 2026-06-15 | 0.17% | 0.86% | +0.69% |
| 2 | 2025-03-17 | 0.05% | 0.17% | +0.12% |
| 3 | 2023-03-07 | — | 0.05% | — |
EPSS の全履歴 （全 7 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 |
|---|---|---|---|---|---|---|
| 5.8 | 3.1 | MEDIUM |
|
1.3 | 4.0 | [email protected] |
| 5.8 | 3.1 | MEDIUM |
|
1.3 | 4.0 | [email protected] |
| 3.5 | 2.0 | LOW |
|
6.8 | 2.9 | [email protected] |
GHSA-59qg-grp7-5r73 · 深刻度： medium · エコシステム： go — Weave Net clusters susceptible to MitM attacks via IPv6 rogue router advertisements
| vendor | priority | summary | link |
|---|---|---|---|
ubuntu
|
medium | CVE-2020-11091 medium priority: Ubuntu including 1 source packages (golang-github-weaveworks-mesh-dev), 6 status rows across 6 suites (bionic, eoan, focal, trusty, upstream, xenial): DNE 5, needs-triage 1. | https://ubuntu.com/security/CVE-2020-11091 |
| URL | タグ |
|---|---|
| https://github.com/weaveworks/weave/commit/15f21f1899060f7716c70a8555a084e836f39a60 | Patch Third Party Advisory |
| https://github.com/weaveworks/weave/security/advisories/GHSA-59qg-grp7-5r73 | Third Party Advisory |