The PPTP VPN service in Watchguard Firebox before 10, when performing the MS-CHAPv2 authentication handshake, generates different error codes depending on whether the username is valid or invalid, which allows remote attackers to enumerate valid usernames
Published Apr 7, 2008
5.0
MEDIUMCVSS 2.0
EPSS 1.74%
Description
The PPTP VPN service in Watchguard Firebox before 10, when performing the MS-CHAPv2 authentication handshake, generates different error codes depending on whether the username is valid or invalid, which allows remote attackers to enumerate valid usernames.
Affected products
No data.
- 4.9
- 5.0
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:L/Au:N/C:P/I:N/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 1, 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 (11 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 1.74% (0.01738) | 76.87th | v5 (v2026.06.15) |
| Jun 15, 2026 | 1.74% (0.01738) | 74.68th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.61% (0.00610) | 67.91th | v4 (v2025.03.14) |
| Dec 12, 2024 | 1.44% (0.01442) | 87.16th | v3 (v2023.03.01) |
| Apr 13, 2024 | 1.17% (0.01173) | 84.78th | v3 (v2023.03.01) |
| Apr 9, 2024 | 1.08% (0.01085) | 84.07th | v3 (v2023.03.01) |
| Mar 7, 2023 | 1.08% (0.01085) | 82.07th | 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 (7)
- http://secunia.com/advisories/29708 third-party-advisoryx_refsource_SECUNIAVendor Advisory
- http://www.mwrinfosecurity.com/publications/mwri_watchguard-firebox-pptp-vpn-user-enumeration-advisory_2008-04-04.pdf x_refsource_MISCExploitPatch
- http://www.osvdb.org/44218 vdb-entryx_refsource_OSVDB
- http://www.securityfocus.com/bid/28619 vdb-entryx_refsource_BID
- http://www.securitytracker.com/id?1019796 vdb-entryx_refsource_SECTRACK
- http://www.vupen.com/english/advisories/2008/1152/references vdb-entryx_refsource_VUPENVendor Advisory
- https://exchange.xforce.ibmcloud.com/vulnerabilities/41683 vdb-entryx_refsource_XF
| Link | Providers | Tags |
|---|---|---|
| http://secunia.com/advisories/29708 | third-party-advisoryx_refsource_SECUNIAVendor Advisory | |
| http://www.mwrinfosecurity.com/publications/mwri_watchguard-firebox-pptp-vpn-user-enumeration-advisory_2008-04-04.pdf | x_refsource_MISCExploitPatch | |
| http://www.osvdb.org/44218 | vdb-entryx_refsource_OSVDB | |
| http://www.securityfocus.com/bid/28619 | vdb-entryx_refsource_BID | |
| http://www.securitytracker.com/id?1019796 | vdb-entryx_refsource_SECTRACK | |
| http://www.vupen.com/english/advisories/2008/1152/references | vdb-entryx_refsource_VUPENVendor Advisory | |
| https://exchange.xforce.ibmcloud.com/vulnerabilities/41683 | vdb-entryx_refsource_XF |
Change history (0)
No recorded changes yet.