mod_fcgid: mod_fcgid sets environmental variable based on user supplied Proxy request header
Published Dec 3, 2019
8.8
HIGHCVSS 3.1
EPSS 2.23%
Description
A security Bypass vulnerability exists in the FcgidPassHeader Proxy in mod_fcgid through 2016-07-07.
Affected products
No data.
No data.
Red Hat Enterprise Linux 7
mod_fcgid
Will not fix
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 7 | mod_fcgid | Will not fix | n/a |
No package ranges for this CVE.
Remediation
Red Hat statement
This issue is addressed through the Apache HTTPD update for CVE-2016-5387 which prevent the Proxy header from automatically being converted into the HTTP_PROXY environmental variable. Unless the "FcgidPassHeader Proxy" is used mod_fcgid is not vulnerable to this attack when used with updated HTTPD. This issue is not currently planned to be addressed in future updates. For additional information, refer to the Issue Severity Classification: https://access.redhat.com/security/updates/classification/.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:N
AV:N/AC:L/Au:S/C:P/I:P/A:P
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 (11 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 2, 2026 | 2.23% (0.02228) | 82.13th | v5 (v2026.06.15) |
| Jun 15, 2026 | 2.23% (0.02228) | 80.37th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.55% (0.00547) | 65.89th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.63% (0.00628) | 79.70th | v3 (v2023.03.01) |
| Feb 8, 2024 | 0.76% (0.00761) | 80.56th | v3 (v2023.03.01) |
| May 8, 2023 | 0.76% (0.00761) | 78.47th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.54% (0.00537) | 73.66th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.16% (0.01164) | 61.38th | v2 (v2022.01.01) |
| Oct 18, 2022 | 1.16% (0.01164) | 60.38th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.16% (0.01164) | 58.38th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.16% (0.01164) | 34.94th | v2 (v2022.01.01) |
References (8)
- http://lists.opensuse.org/opensuse-updates/2016-08/msg00084.html x_refsource_MISCMailing ListThird Party Advisory
- http://www.openwall.com/lists/oss-security/2016/07/18/6 x_refsource_MISC
- http://www.securityfocus.com/bid/91822 x_refsource_MISC
- https://access.redhat.com/security/cve/CVE-2016-1000104 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1353760 Issue Tracking
- https://nvd.nist.gov/vuln/detail/CVE-2016-1000104
- https://www.cve.org/CVERecord?id=CVE-2016-1000104
- https://www.tenable.com/security/tns-2017-04 x_refsource_MISC
| Link | Providers | Tags |
|---|---|---|
| http://lists.opensuse.org/opensuse-updates/2016-08/msg00084.html | x_refsource_MISCMailing ListThird Party Advisory | |
| http://www.openwall.com/lists/oss-security/2016/07/18/6 | x_refsource_MISC | |
| http://www.securityfocus.com/bid/91822 | x_refsource_MISC | |
| https://access.redhat.com/security/cve/CVE-2016-1000104 | Vendor Advisory | |
| https://bugzilla.redhat.com/show_bug.cgi?id=1353760 | Issue Tracking | |
| https://nvd.nist.gov/vuln/detail/CVE-2016-1000104 | ||
| https://www.cve.org/CVERecord?id=CVE-2016-1000104 | ||
| https://www.tenable.com/security/tns-2017-04 | x_refsource_MISC |
Change history (0)
No recorded changes yet.