flex.skl in Will Estes and John Millaway Fast Lexical Analyzer Generator (flex) before 2.5.33 does not allocate enough memory for grammars containing (1) REJECT statements or (2) trailing context rules, which causes flex to generate code that contains a buffer overflow that might allow context-dependent attackers to execute arbitrary code.
総合評価: CVE-2006-0459 は中リスク(60.1/100)。CVSS 深刻度は高。悪用される可能性が高い(EPSS 3.97%、88 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 | 2025-06-04 | 4.56% | 3.97% | -0.59% |
| 2 | 2025-03-30 | 7.11% | 4.56% | -2.56% |
| 3 | 2025-03-29 | — | 7.11% | — |
EPSS の全履歴 (全 10 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 | 2.0 | HIGH |
|
10.0 | 6.4 | [email protected] |
| vendor | priority | summary | link |
|---|---|---|---|
debian
|
not yet assigned | CVE-2006-0459 not yet assigned priority: Debian including 1 source packages (flex), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. | https://security-tracker.debian.org/tracker/CVE-2006-0459 |
gentoo
|
normal | CVE-2006-0459: 1 GLSA(s) (200603-07), 1 atom(s) (sys-devel/flex); latest impact normal. | https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2006-0459 |
redhat
|
— | — | https://access.redhat.com/security/cve/CVE-2006-0459 |
ubuntu
|
medium | CVE-2006-0459 medium priority: Ubuntu including 8 source packages (cyrus21-imapd, flex, …), 32 status rows across 4 suites (dapper, edgy, feisty, upstream): released 14, not-affected 9, needs-triage 8, ignored 1. | https://ubuntu.com/security/CVE-2006-0459 |
This issue only affects parsers which are generated by grammars which either use REJECT or rules with a variable trailing context (in these rules the parser has to keep all backtracking paths). The Red Hat Security Response Team analysed all packages that include flex generated parsers in Red Hat Enterprise Linux (2.1, 3, and 4) and found none were vulnerable.
| URL | タグ |
|---|---|
| http://prdownloads.sourceforge.net/flex/flex-2.5.33.tar.bz2?download | Product |
| http://secunia.com/advisories/19071 | Patch Vendor Advisory |
| http://secunia.com/advisories/19126 | Vendor Advisory |
| http://secunia.com/advisories/19228 | Vendor Advisory |
| http://secunia.com/advisories/19424 | Patch Vendor Advisory |
| http://securityreason.com/securityalert/570 | Third Party Advisory |
| http://sourceforge.net/mailarchive/forum.php?thread_name=20060223020346.GA11231%40tabitha.home.tldz.org&forum_name=flex-announce | Release Notes |
| http://www.gentoo.org/security/en/glsa/glsa-200603-07.xml | Third Party Advisory |
| http://www.osvdb.org/23440 | Broken Link Patch |
| http://www.securityfocus.com/bid/16896 | Patch Third Party Advisory VDB Entry |
| http://www.us.debian.org/security/2006/dsa-1020 | Patch Vendor Advisory |
| http://www.vupen.com/english/advisories/2006/0770 | Broken Link URL Repurposed |
| https://exchange.xforce.ibmcloud.com/vulnerabilities/24995 | VDB Entry |
| https://usn.ubuntu.com/260-1/ | Third Party Advisory |