CVE-2009-4409

critical

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.

References

http://www.seil.jp/seilseries/security/2009/a00697.php

http://www.securityfocus.com/bid/37293

http://www.osvdb.org/61118

http://secunia.com/advisories/37628

http://jvndb.jvn.jp/ja/contents/2009/JVNDB-2009-000079.html

http://jvn.jp/en/jp/JVN49602378/index.html

Details

Source: Mitre, NVD

Published: 2009-12-23

Updated: 2026-06-16

Risk Information

CVSS v2

Base Score: 2.6

Vector: CVSS2#AV:N/AC:H/Au:N/C:N/I:P/A:N

Severity: Low

CVSS v3

Base Score: 9.8

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Severity: Critical

EPSS

EPSS: 0.0029