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)

Published: 2019-11-19 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2011-4968 is rated Low Risk (39.8/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 0.39%). Monitor for updates and reassess as exploit intelligence or EPSS changes.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2011-4968

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2025-12-28 0.60% 0.39% -0.21%
2 2025-12-27 0.39% 0.60% +0.21%
3 2025-10-28 — 0.39% —

Full EPSS history (14 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2011-4968

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
4.8 3.1 MEDIUM
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:H)
Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:L)
Some sensitive info could get out, but not a total data dump.
Integrity (I:L)
Attackers could change some data, but it’s limited—not everything goes.
Availability (A:N)
Service keeps running; no real outage angle.
 2.2 2.5 [email protected]
5.8 2.0 MEDIUM
AV:N/AC:M/Au:N/C:P/I:P/A:N Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:M)
Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:N)
No availability impact.
 8.6 4.9 [email protected]

Weakness enumeration for CVE-2011-4968

OS Trackers for CVE-2011-4968

vendor priority summary link
debian low CVE-2011-4968 low priority: Debian including 1 source packages (nginx), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2011-4968
ubuntu low CVE-2011-4968 low priority: Ubuntu including 1 source packages (nginx), 11 status rows across 11 suites (hardy, lucid, oneiric, precise, quantal, raring, saucy, trusty, upstream, utopic, vivid): ignored 10, released 1. https://ubuntu.com/security/CVE-2011-4968

Affected software / configurations for CVE-2011-4968

Vendor Product Version Raw CPE
f5 nginx 0.7.61 cpe:2.3:a:f5:nginx:0.7.61:*:*:*:*:*:*:*
f5 nginx 0.7.62 cpe:2.3:a:f5:nginx:0.7.62:*:*:*:*:*:*:*
f5 nginx 0.7.64 cpe:2.3:a:f5:nginx:0.7.64:*:*:*:*:*:*:*
f5 nginx 0.7.65 cpe:2.3:a:f5:nginx:0.7.65:*:*:*:*:*:*:*
f5 nginx 0.7.66 cpe:2.3:a:f5:nginx:0.7.66:*:*:*:*:*:*:*
f5 nginx 0.8.33 cpe:2.3:a:f5:nginx:0.8.33:*:*:*:*:*:*:*
f5 nginx 0.8.35 cpe:2.3:a:f5:nginx:0.8.35:*:*:*:*:*:*:*
f5 nginx 0.8.36 cpe:2.3:a:f5:nginx:0.8.36:*:*:*:*:*:*:*
f5 nginx 0.8.40 cpe:2.3:a:f5:nginx:0.8.40:*:*:*:*:*:*:*
f5 nginx 1.2.6 cpe:2.3:a:f5:nginx:1.2.6:*:*:*:*:*:*:*
debian debian_linux 8.0 cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*

References for CVE-2011-4968

cvelogic Threat Intelligence