CVE-2011-4968
nginx http proxy module does not verify peer identity of https origin server which could...
nginx http proxy module does not verify peer identity of https origin server which could facilitate man-in-the-middle attack (MITM)
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- High
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- Low
- Integrity
- Low
- Availability
- None
Exploit likelihood
What each source reports
NVD Score used
nginx http proxy module does not verify peer identity of https origin server which could facilitate man-in-the-middle attack (MITM)
- Record
CVE-2011-4968- CVSS 3.1
- 4.8 Medium
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N - CVSS 2.0
- 5.8 Medium
AV:N/AC:M/Au:N/C:P/I:P/A:N - Weakness
- CWE-20
- Updated
- 2026-11-02
CVE List No score
nginx http proxy module does not verify peer identity of https origin server which could facilitate man-in-the-middle attack (MITM)
- Record
CVE-2011-4968- Updated
- 2026-11-02
EUVDEUVD-2011-4874 No score
nginx http proxy module does not verify peer identity of https origin server which could facilitate man-in-the-middle attack (MITM)
- Record
EUVD-2011-4874- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-x9wg-g9hq-p992
nginx http proxy module does not verify peer identity of https origin server which could...
nginx http proxy module does not verify peer identity of https origin server which could facilitate man-in-the-middle attack (MITM)
- Record
GHSA-x9wg-g9hq-p992- CVSS 3.1
- 4.8 Medium
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N - Weakness
- CWE-20
- Updated
- 2026-11-02
OSV
nginx http proxy module does not verify peer identity of https origin server which could facilitate man-in-the-middle attack (MITM)
- Record
CVE-2011-4968- CVSS 3.1
- 4.8 Medium
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N - Updated
- 2026-11-02
OSVDEBIAN-CVE-2011-4968
nginx http proxy module does not verify peer identity of https origin server which could facilitate man-in-the-middle attack (MITM)
- Record
DEBIAN-CVE-2011-4968- CVSS 3.1
- 4.8 Medium
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N - Updated
- 2026-11-02
OSVUBUNTU-CVE-2011-4968
nginx http proxy module does not verify peer identity of https origin server which could facilitate man-in-the-middle attack (MITM)
- Record
UBUNTU-CVE-2011-4968- CVSS 3.1
- 4.8 Medium
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N - Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
nginxDebian:12 |
before 1.9.1-1 | 1.9.1-1 |
nginxDebian:13 |
before 1.9.1-1 | 1.9.1-1 |
nginxDebian:14 |
before 1.9.1-1 | 1.9.1-1 |
nginxUbuntu:Pro:14.04:LTS |
All versions, plus listed versions 1.4.1-3ubuntu11.4.3-2ubuntu11.4.4-1ubuntu11.4.4-2ubuntu11.4.4-4ubuntu1 Show 19 moreShow less1.4.5-1ubuntu11.4.6-1ubuntu21.4.6-1ubuntu31.4.6-1ubuntu3.11.4.6-1ubuntu3.21.4.6-1ubuntu3.31.4.6-1ubuntu3.41.4.6-1ubuntu3.51.4.6-1ubuntu3.61.4.6-1ubuntu3.71.4.6-1ubuntu3.81.4.6-1ubuntu3.91.4.6-1ubuntu3.9+esm11.4.6-1ubuntu3.9+esm21.4.6-1ubuntu3.9+esm31.4.6-1ubuntu3.9+esm41.4.6-1ubuntu3.9+esm51.4.6-1ubuntu3.9+esm61.4.6-1ubuntu3.9+esm8 |
None known |
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2011-4968 is a medium vulnerability (CVSS 4.8) in F5 Nginx, published November 19, 2019. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 3.99%, the 90th percentile. Fixed in nginx 1.9.1-1.