CVE-2009-4409

Severity: low (CVSS 2.6 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2009-12-23 · updated 2026-06-16
Weakness: CWE-287

Description

The (1) CHAP and (2) MS-CHAP-V2 authentication capabilities in the PPP Access Concentrator (PPPAC) function in Internet Initiative Japan SEIL/B1 firmware 1.00 through 2.52 use the same challenge for each authentication attempt, which allows remote attackers to bypass authentication via a replay attack.

Affected products

Iij Seil/B1: 1.00, 2.01, 2.10, 2.20, 2.30, 2.40 (+5)

References

http://jvn.jp/en/jp/JVN49602378/index.html
http://jvndb.jvn.jp/ja/contents/2009/JVNDB-2009-000079.html
http://secunia.com/advisories/37628
http://www.osvdb.org/61118
http://www.securityfocus.com/bid/37293
http://www.seil.jp/seilseries/security/2009/a00697.php
http://jvn.jp/en/jp/JVN49602378/index.html
http://jvndb.jvn.jp/ja/contents/2009/JVNDB-2009-000079.html
http://secunia.com/advisories/37628
http://www.osvdb.org/61118
http://www.securityfocus.com/bid/37293
http://www.seil.jp/seilseries/security/2009/a00697.php

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