RARLAB WinRAR Recovery Volume Improper Validation of Array Index Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of RARLAB WinRAR. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file. The specific flaw exists within the processing of recovery volumes. The issue results from the lack of proper validation of user-supplied data, which can result in a memory access past the end of an allocated buffer. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-21233.
総合評価: CVE-2023-40477 は高リスク（65.3/100）。CVSS 深刻度は高。悪用される可能性が高い（EPSS 91.89%、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 | 2026-05-22 | 92.64% | 91.89% | -0.76% |
| 2 | 2026-04-23 | 92.80% | 92.64% | -0.16% |
| 3 | 2025-11-20 | — | 92.80% | — |
EPSS の全履歴 （全 26 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 |
|---|---|---|---|---|---|---|
| 7.8 | 3.0 | HIGH |
|
1.8 | 5.9 | [email protected] |
| vendor | priority | summary | link |
|---|---|---|---|
debian
|
not yet assigned | CVE-2023-40477 not yet assigned priority: Debian including 3 source packages (libclamunrar, rar, unrar-nonfree), 15 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 15. | https://security-tracker.debian.org/tracker/CVE-2023-40477 |
gentoo
|
normal | CVE-2023-40477: 2 GLSA(s) (202309-04, 202507-03), 3 atom(s) (app-antivirus/clamav, app-arch/rar, app-arch/unrar); latest impact normal. | https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2023-40477 |
suse
|
high | CVE-2023-40477 severity important: SUSE including 30 source package names (clamav-0.103.11-150000.3.50.1, clamav-0.103.11-150600.16.7, …), 110 product×package rows across 30 product lines (Image SLES12-SP5-SAP-Azure-LI-BYOS-Production, Image SLES12-SP5-SAP-Azure-VLI-BYOS-Production, … (30 product lines)): Fixed 110. | https://www.suse.com/security/cve/CVE-2023-40477/ |
ubuntu
|
medium | CVE-2023-40477 medium priority: Ubuntu including 3 source packages (libclamunrar, rar, unrar-nonfree), 36 status rows across 12 suites (bionic, focal, jammy, lunar, mantic, noble, oracular, plucky, questing, trusty, upstream, xenial): released 16, not-affected 9, needed 6, ignored 5. | https://ubuntu.com/security/CVE-2023-40477 |