LibVNC before commit ca2a5ac02fbbadd0a21fabba779c1ea69173d10b contains heap use-after-free vulnerability in server code of file transfer extension that can result remote code execution.
総合評価: CVE-2018-6307 は中リスク(63.4/100)。CVSS 深刻度は高。悪用される可能性が高い(EPSS 9.47%、93 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 | 2025-12-28 | 10.83% | 9.47% | -1.35% |
| 2 | 2025-12-27 | 9.47% | 10.83% | +1.35% |
| 3 | 2025-11-19 | — | 9.47% | — |
EPSS の全履歴 (全 24 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 | 3.0 | HIGH |
|
2.2 | 5.9 | [email protected] |
| 6.8 | 2.0 | MEDIUM |
|
8.6 | 6.4 | [email protected] |
| vendor | priority | summary | link |
|---|---|---|---|
alpine
|
high | CVE-2018-6307: 1 source package rows (libvncserver); 4 state rows across 2 repos (3.22-community, edge-community); fixed 0, open 4. | https://security.alpinelinux.org/vuln/CVE-2018-6307 |
debian
|
not yet assigned | CVE-2018-6307 not yet assigned priority: Debian including 1 source packages (libvncserver), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. | https://security-tracker.debian.org/tracker/CVE-2018-6307 |
redhat
|
high | — | https://access.redhat.com/security/cve/CVE-2018-6307 |
suse
|
critical | CVE-2018-6307 severity critical: SUSE including 22 source package names (LibVNCServer-0.9.1-160.6.1, LibVNCServer-devel-0.9.1-160.6.1, …), 86 product×package rows across 54 product lines (SUSE Enterprise Storage 4, SUSE Linux Enterprise High Performance Computing 12 SP5, … (54 product lines)): Fixed 86. | https://www.suse.com/security/cve/CVE-2018-6307/ |
ubuntu
|
medium | CVE-2018-6307 medium priority: Ubuntu including 2 source packages (libvncserver, x11vnc), 12 status rows across 6 suites (bionic, cosmic, disco, trusty, upstream, xenial): not-affected 5, released 5, ignored 1, needs-triage 1. | https://ubuntu.com/security/CVE-2018-6307 |
| ベンダー | 製品 | バージョン | 生の CPE |
|---|---|---|---|
| libvnc_project | libvncserver | < 0.9.12 | cpe:2.3:a:libvnc_project:libvncserver:*:*:*:*:*:*:*:* |
| canonical | ubuntu_linux | 14.04 | cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:* |
| canonical | ubuntu_linux | 16.04 | cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:* |
| canonical | ubuntu_linux | 18.04 | cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:* |
| canonical | ubuntu_linux | 18.10 | cpe:2.3:o:canonical:ubuntu_linux:18.10:*:*:*:*:*:*:* |
| debian | debian_linux | 8.0 | cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:* |
| debian | debian_linux | 9.0 | cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* |
| URL | タグ |
|---|---|
| https://ics-cert.kaspersky.com/advisories/klcert-advisories/2018/12/19/klcert-18-026-libvnc-heap-use-after-free/ | Third Party Advisory |
| https://lists.debian.org/debian-lts-announce/2018/12/msg00017.html | Mailing List Third Party Advisory |
| https://lists.debian.org/debian-lts-announce/2019/10/msg00042.html | |
| https://usn.ubuntu.com/3877-1/ | Third Party Advisory |
| https://www.debian.org/security/2019/dsa-4383 | Third Party Advisory |
| https://github.com/LibVNC/libvncserver/issues/241 | Third Party Advisory |