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
Published Dec 23, 2009
2.6
LOWCVSS 2.0
EPSS 1.36%
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
No data.
- 1.00
- 2.01
- 2.10
- 2.20
- 2.30
- 2.40
- 2.41
- 2.42
- 2.50
- 2.51
- 2.52
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
No CVSS v3.0 score for this CVE.
AV:N/AC:H/Au:N/C:N/I:P/A:N
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 2, 2026.
Score over time
2022–2026- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (13 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 2, 2026 | 1.36% (0.01356) | 70.67th | v5 (v2026.06.15) |
| Jun 15, 2026 | 1.36% (0.01356) | 67.92th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.29% (0.00290) | 50.31th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.55% (0.00553) | 78.30th | v3 (v2023.03.01) |
| Apr 25, 2024 | 0.49% (0.00492) | 75.88th | v3 (v2023.03.01) |
| Mar 15, 2024 | 0.47% (0.00468) | 74.98th | v3 (v2023.03.01) |
| Feb 8, 2024 | 0.39% (0.00394) | 72.71th | v3 (v2023.03.01) |
| Jul 4, 2023 | 0.55% (0.00553) | 74.41th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.78% (0.00783) | 78.67th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.32% (0.01319) | 71.27th | v2 (v2022.01.01) |
| Feb 23, 2023 | 1.32% (0.01319) | 71.23th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.32% (0.01319) | 69.22th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.32% (0.01319) | 44.98th | v2 (v2022.01.01) |
References (6)
- http://jvn.jp/en/jp/JVN49602378/index.html third-party-advisoryx_refsource_JVN
- http://jvndb.jvn.jp/ja/contents/2009/JVNDB-2009-000079.html third-party-advisoryx_refsource_JVNDB
- http://secunia.com/advisories/37628 third-party-advisoryx_refsource_SECUNIAVendor Advisory
- http://www.osvdb.org/61118 vdb-entryx_refsource_OSVDB
- http://www.securityfocus.com/bid/37293 vdb-entryx_refsource_BID
- http://www.seil.jp/seilseries/security/2009/a00697.php x_refsource_CONFIRMVendor Advisory
| Link | Providers | Tags |
|---|---|---|
| http://jvn.jp/en/jp/JVN49602378/index.html | third-party-advisoryx_refsource_JVN | |
| http://jvndb.jvn.jp/ja/contents/2009/JVNDB-2009-000079.html | third-party-advisoryx_refsource_JVNDB | |
| http://secunia.com/advisories/37628 | third-party-advisoryx_refsource_SECUNIAVendor Advisory | |
| http://www.osvdb.org/61118 | vdb-entryx_refsource_OSVDB | |
| http://www.securityfocus.com/bid/37293 | vdb-entryx_refsource_BID | |
| http://www.seil.jp/seilseries/security/2009/a00697.php | x_refsource_CONFIRMVendor Advisory |
Change history (0)
No recorded changes yet.