An issue was discovered in LibVNCServer before 0.9.13. There is an information leak (of uninitialized memory contents) in the libvncclient/rfbproto.c ConnectToRFBRepeater function.
総合評価: CVE-2018-21247 は中リスク（58.4/100）。CVSS 深刻度は高。悪用される可能性が高い（EPSS 1.48%、81 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 | 2025-12-28 | 1.29% | 1.48% | +0.19% |
| 2 | 2025-12-27 | 1.48% | 1.29% | -0.19% |
| 3 | 2025-11-21 | — | 1.48% | — |
EPSS の全履歴 （全 17 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 |
|---|---|---|---|---|---|---|
| 7.5 | 3.1 | HIGH |
|
3.9 | 3.6 | [email protected] |
| 5.0 | 2.0 | MEDIUM |
|
10.0 | 2.9 | [email protected] |
| vendor | priority | summary | link |
|---|---|---|---|
alpine
|
high | CVE-2018-21247: 1 source package rows (libvncserver); 7 state rows across 3 repos (3.11-main, 3.22-community, edge-community); fixed 0, open 7. | https://security.alpinelinux.org/vuln/CVE-2018-21247 |
debian
|
not yet assigned | CVE-2018-21247 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-2018-21247 |
redhat
|
medium | — | https://access.redhat.com/security/cve/CVE-2018-21247 |
suse
|
high | CVE-2018-21247 severity important: SUSE including 23 source package names (LibVNCServer, LibVNCServer-devel-0.9.10-4.22.1, …), 87 product×package rows across 49 product lines (HPE Helion OpenStack 8, SUSE Enterprise Storage 5, … (49 product lines)): Fixed 84, Known Not Affected 3. | https://www.suse.com/security/cve/CVE-2018-21247/ |
ubuntu
|
low | CVE-2018-21247 low priority: Ubuntu including 4 source packages (libvncserver, veyon, vino, x11vnc), 67 status rows across 17 suites (bionic, eoan, focal, groovy, hirsute, impish, jammy, kinetic, lunar, mantic, noble, oracular, plucky, questing, trusty, upstream, xenial): not-affected 31, ignored 17, needs-triage 14, DNE 5. | https://ubuntu.com/security/CVE-2018-21247 |
| 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:*:*:*:esm:*:*:* |
| 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:*:*:*:*:*:*:* |
| siemens | simatic_itc1500_firmware | >= 3.0.0.0, < 3.2.1.0 | cpe:2.3:o:siemens:simatic_itc1500_firmware:*:*:*:*:*:*:*:* |
| siemens | simatic_itc1500_pro_firmware | >= 3.0.0.0, < 3.2.1.0 | cpe:2.3:o:siemens:simatic_itc1500_pro_firmware:*:*:*:*:*:*:*:* |
| siemens | simatic_itc1900_firmware | >= 3.0.0.0, < 3.2.1.0 | cpe:2.3:o:siemens:simatic_itc1900_firmware:*:*:*:*:*:*:*:* |
| siemens | simatic_itc1900_pro_firmware | >= 3.0.0.0, < 3.2.1.0 | cpe:2.3:o:siemens:simatic_itc1900_pro_firmware:*:*:*:*:*:*:*:* |
| siemens | simatic_itc2200_firmware | >= 3.0.0.0, < 3.2.1.0 | cpe:2.3:o:siemens:simatic_itc2200_firmware:*:*:*:*:*:*:*:* |
| siemens | simatic_itc2200_pro_firmware | >= 3.0.0.0, < 3.2.1.0 | cpe:2.3:o:siemens:simatic_itc2200_pro_firmware:*:*:*:*:*:*:*:* |
| opensuse | leap | 15.2 | cpe:2.3:o:opensuse:leap:15.2:*:*:*:*:*:*:* |
| URL | タグ |
|---|---|
| http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00033.html | Mailing List Third Party Advisory |
| http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00055.html | Mailing List Third Party Advisory |
| http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00066.html | Mailing List Third Party Advisory |
| https://cert-portal.siemens.com/productcert/pdf/ssa-390195.pdf | Patch Third Party Advisory |
| https://github.com/LibVNC/libvncserver/compare/LibVNCServer-0.9.12...LibVNCServer-0.9.13 | Patch Third Party Advisory |
| https://github.com/LibVNC/libvncserver/issues/253 | Issue Tracking Third Party Advisory |
| https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4F6FUH4EFK4NAP6GT4TQRTBKWIRCZLIY/ | |
| https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/NVP7TJVYJDXDFRHVQ3ENEN3H354QPXEZ/ |