CVE-2012-0920

Use-after-free vulnerability in Dropbear SSH Server 0.52 through 2012.54, when command restriction and public key authentication are enabled, allows remote authenticated users to execute arbitrary code and bypass command restrictions via multiple crafted command requests, related to "channels concurrency."

Published: 2012-06-05 Last update: 2026-04-29 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2012-0920 is rated High Risk (65.6/100): CVSS High severity, with high exploitation likelihood (EPSS 6.49%, 93th percentile). EPSS ranks this CVE among the most likely to be exploited in the near term. EPSS rose +4.69% over the last day, indicating growing attacker interest. High exploitation likelihood—assess exposure and prioritize remediation.

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-2012-0920

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 1.80% 6.49% +4.69%
2 2025-03-30 5.92% 1.80% -4.12%
3 2025-03-29 — 5.92% —

Full EPSS history (9 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2012-0920

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.1 2.0 HIGH
AV:N/AC:H/Au:S/C:C/I:C/A:C Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:H)
Exploitation requires uncommon or highly specific conditions.
Authentication (AU:S)
A single authentication is required.
Confidentiality impact (C:C)
Complete confidentiality impact.
Integrity impact (I:C)
Complete integrity impact.
Availability impact (A:C)
Complete availability impact.
 3.9 10.0 [email protected]

Weakness enumeration for CVE-2012-0920

OS Trackers for CVE-2012-0920

vendor priority summary link
debian low CVE-2012-0920 low priority: Debian including 1 source packages (dropbear), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2012-0920
gentoo normal CVE-2012-0920: 1 GLSA(s) (201309-20), 1 atom(s) (net-misc/dropbear); latest impact normal. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2012-0920
ubuntu medium CVE-2012-0920 medium priority: Ubuntu including 1 source packages (dropbear), 6 status rows across 6 suites (hardy, lucid, natty, oneiric, precise, upstream): released 5, ignored 1. https://ubuntu.com/security/CVE-2012-0920

Affected software / configurations for CVE-2012-0920

Vendor Product Version Raw CPE
dropbear_ssh_project dropbear_ssh >= 0.52, <= 2012.54 cpe:2.3:a:dropbear_ssh_project:dropbear_ssh:*:*:*:*:*:*:*:*
debian debian_linux 6.0 cpe:2.3:o:debian:debian_linux:6.0:*:*:*:*:*:*:*
debian debian_linux 7.0 cpe:2.3:o:debian:debian_linux:7.0:*:*:*:*:*:*:*

References for CVE-2012-0920

cvelogic Threat Intelligence