CVE-2011-4076

Exp

OpenStack Nova before 2012.1 allows someone with access to an EC2_ACCESS_KEY (equivalent to a username) to obtain the EC2_SECRET_KEY (equivalent to a password). Exposing the EC2_ACCESS_KEY via http or tools that allow man-in-the-middle over https could allow an attacker to easily obtain the EC2_SECRET_KEY. An attacker could also presumably brute force values for EC2_ACCESS_KEY.

Published: 2019-11-26 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2011-4076 is rated High Exploit Risk (64.1/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 1.45%). 2 public exploit reference(s) are indexed (Exploit-DB). EPSS rose +1.04% over the last day, indicating growing attacker interest. Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

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

Public exploit references (Exploit-DB) for CVE-2011-4076

EDB-ID Source Kind Published Link
— nvd_ref exploit_tag Exploit-DB ↗
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2011-4076

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 2026-06-15 0.41% 1.45% +1.04%
2 2025-04-07 0.25% 0.41% +0.15%
3 2025-03-17 — 0.25% —

Full EPSS history (8 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2011-4076

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.9 3.1 MEDIUM
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/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:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:N)
Service keeps running; no real outage angle.
 2.2 3.6 [email protected]
4.3 2.0 MEDIUM
AV:N/AC:M/Au:N/C:P/I:N/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:N)
No integrity impact.
Availability impact (A:N)
No availability impact.
 8.6 2.9 [email protected]

Weakness enumeration for CVE-2011-4076

GitHub Security Advisory for CVE-2011-4076

GHSA-vcmv-6rxx-fh7r · Severity: medium · Ecosystem: pip — OpenStack Nova Exposure of Sensitive Information to an Unauthorized Actor

OS Trackers for CVE-2011-4076

vendor priority summary link
debian not yet assigned CVE-2011-4076 not yet assigned priority: Debian including 1 source packages (nova), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2011-4076
redhat — — https://access.redhat.com/security/cve/CVE-2011-4076
ubuntu high CVE-2011-4076 high priority: Ubuntu including 1 source packages (nova), 6 status rows across 6 suites (hardy, lucid, maverick, natty, oneiric, upstream): released 4, DNE 2. https://ubuntu.com/security/CVE-2011-4076

Affected software / configurations for CVE-2011-4076

Vendor Product Version Raw CPE
openstack nova >= 2010.1, < 2012.1 cpe:2.3:a:openstack:nova:*:*:*:*:*:*:*:*

References for CVE-2011-4076

URL Tags
https://access.redhat.com/security/cve/cve-2011-4076 Third Party Advisory
https://bugs.launchpad.net/nova/+bug/868360 Exploit Issue Tracking Patch Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2011-4076 Exploit Issue Tracking Third Party Advisory
https://security-tracker.debian.org/tracker/CVE-2011-4076 Patch Third Party Advisory
https://www.openwall.com/lists/oss-security/2011/10/25/4 Mailing List Patch Third Party Advisory
cvelogic Threat Intelligence