CVE-2009-4409

Name: CVE-2009-4409
Creator: NVD / NIST
Published: 2009-12-23T21:30:00.313+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 1.36%

Last modified Jun 16, 2026

CVE-2009-4409 is a vulnerability of currently unknown severity. 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.. EPSS estimates a 1.36% chance of exploitation in the next 30 days.

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.

Metrics

EPSS Probability

1.36%

68.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-287

Affected Software

Vendor	Product	Versions
Iij	Seil\/B1	1.00
Iij	Seil\/B1	2.01
Iij	Seil\/B1	2.10
Iij	Seil\/B1	2.20
Iij	Seil\/B1	2.30
Iij	Seil\/B1	2.40
Iij	Seil\/B1	2.41
Iij	Seil\/B1	2.42
Iij	Seil\/B1	2.50
Iij	Seil\/B1	2.51
Iij	Seil\/B1	2.52

References

Timeline

Published: Dec 23, 2009
Last Modified: Jun 16, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2009-4409?

How severe is CVE-2009-4409?

Severity scoring for CVE-2009-4409 is pending analysis. The EPSS model estimates a 1.36% probability of exploitation in the next 30 days.

How do I fix CVE-2009-4409?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2009-4409?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST