CVE-2012-4562
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedMultiple integer overflows in libssh before 0.5.3 allow remote attackers to cause a denial of service (infinite loop or crash) and possibly execute arbitrary code via unspecified vectors, which triggers a buffer overflow, infinite loop, or possibly some other unspecified vulnerabilities.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · moderate confidenceMultiple integer overflow vulnerabilities exist in libssh versions prior to 0.5.3. These flaws can be triggered by remote attackers through unspecified vectors, leading to buffer overflows, infinite loops, or other memory corruption issues. The vulnerabilities may allow denial of service (crash or infinite loop) and potentially arbitrary code execution.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data<= 0.5.2= 0.4.7= 0.4.8= 0.5.0= 0.5.1CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Authentication
- None
- Confidentiality
- Partial
- Integrity
- Partial
- Availability
- Partial
AV:N/AC:L/Au:N/C:P/I:P/A:P
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Check if libssh library is installedSearch for libssh library files on the system. On Linux/Unix, check common locations like /usr/lib/, /usr/local/lib/, or use commands like 'dpkg -l | grep libssh' (Debian-based) or 'rpm -qa | grep libssh' (RPM-based). On Windows, search for files named 'libssh.dll' or 'libssh.lib'.Affected if The library is found on the system.
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Determine installed libssh versionRun version detection command appropriate to your system. For package-managed systems: 'dpkg -s libssh-4' or 'rpm -qi libssh'. For source installations, check the library itself using 'strings libssh.so.* | grep -i version' or check any version file in the installation directory.Affected if A version is returned that matches <= 0.5.2, or specifically 0.4.7, 0.4.8, 0.5.0, or 0.5.1.
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Verify exact version against affected rangesCompare your identified version number to the affected list: versions 0.4.7, 0.4.8, 0.5.0, 0.5.1, and any version 0.5.2 or lower are vulnerable.Affected if The installed version is 0.5.2 or lower, including the specific versions 0.4.7, 0.4.8, 0.5.0, or 0.5.1.
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Identify applications using libsshSearch for applications or services that link to libssh: use 'ldd' on suspected binaries, check SSH daemon configurations, or review application dependency lists. Common indicators include SSH servers, SFTP clients, or Git over SSH tools.Affected if Any application or service utilizing the vulnerable libssh library is present on the system.
The system is affected if libssh version 0.5.2 or any of the specific versions 0.4.7, 0.4.8, 0.5.0, or 0.5.1 is installed and any application or service uses that library.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
From vendor dataUpgrade libssh to version 0.5.3 or later to patch the integer overflow vulnerabilities. If upgrading is not immediately feasible, restrict network access to SSH services using the affected library and monitor for signs of exploitation.
- Consultation3.0 h
- Implementation4.0 h
- Testing6.0 h
- Review / QA3.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2012-4562 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2012-4562 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Version or environment caveats, and links to real fixes
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