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CVE-2009-4409
The (1) CHAP and (2) MS-CHAP-V2 authentication capabilities in the PPP Access Concentrator (PPPAC) function in Internet Initiative Japan…
Low2.6EPSS 1.4%
- Published
- Updated
- Reserved
- Assigned by
- mitre
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.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 2.0 | Low2.6 | AV:N/AC:H/Au:N/C:N/I:P/A:N |
- EPSS (exploitation in 30 days)
- 1.4% · top 28% of all CVEs (5 Nov 2026)
Loading the EPSS history…
The list uses the assigner's score when there is one, then CISA's, then NVD's: Low 2.6.
Weakness
Affected products
n/a
- affected n/a
References (6)
- 37628 (opens in a new tab)third-party-advisoryx_refsource_SECUNIAx_transferred
- 37293 (opens in a new tab)vdb-entryx_refsource_BIDx_transferred
- JVN#49602378 (opens in a new tab)third-party-advisoryx_refsource_JVNx_transferred
- 61118 (opens in a new tab)vdb-entryx_refsource_OSVDBx_transferred
- http://www.seil.jp/seilseries/security/2009/a00697.php (opens in a new tab)x_refsource_CONFIRMx_transferred
- JVNDB-2009-000079 (opens in a new tab)third-party-advisoryx_refsource_JVNDBx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
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[](https://trackcve.app/cve/CVE-2009-4409)Record last updated .