YubiserverApplication · Debian
CVE-2015-0843
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 · uneditedyubiserver before 0.6 is prone to buffer overflows due to misuse of sprintf.
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 confidenceyubiserver before version 0.6 contains buffer overflow vulnerabilities caused by improper use of sprintf(), which does not perform bounds checking. This allows attackers to overflow buffers and potentially execute arbitrary code. The CVSS 9.8 rating indicates the flaw is remotely exploitable without authentication and grants complete system compromise.
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
YubiserverApplication
= 0.2-2= 0.5-2CVSS 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
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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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Verify yubiserver package installationQuery the system package manager (dpkg/apt for Debian) for installed yubiserver packages using: dpkg -l | grep yubiserver or apt list --installed 2>/dev/null | grep yubiserverAffected if No yubiserver package is found on the system (not affected)
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Determine installed yubiserver versionIf the package is installed, retrieve its version number: dpkg -s yubiserver | grep Version or rpm -q yubiserverAffected if The installed version is earlier than 0.6 (such as 0.2 or 0.5 Debian packages)
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Confirm yubiserver service is runningCheck if the yubiserver process or service is active: ps aux | grep yubiserver or systemctl status yubiserverAffected if The service is not running (reduced exposure but code flaw still exists in installation)
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Assess network exposure of the serviceCheck if yubiserver is listening on network ports (typically ports 8000 or 443): netstat -tlnp | grep -E '8000|443' or ss -tlnpAffected if The service is exposed to network (remote exploitation possible without authentication)
A system is affected if yubiserver version 0.2 or 0.5 (or any version before 0.6) is installed and the service is running and network-accessible.
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.
dbcve · scopedUpgrade yubiserver to version 0.6 or later to obtain patched code that uses safe string handling functions. If immediate patching is not feasible, restrict network exposure to the service and monitor for exploitation attempts.
yubiserver 0.6
- Download yubiserver version 0.6 or later from the official repository
- Replace the existing yubiserver installation with the updated version
- Verify the sprintf calls have been replaced with secure alternatives (such as snprintf) in the source code
- Restart the yubiserver service
- Confirm the service starts without errors
Generated from the published advisory — verify against the referenced sources before acting.
Fix this in Yubiserver
Scoped from the published advisory
- Consultation4.0 h
- Implementation12.0 h
- Testing6.0 h
- Review / QA3.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $7,040.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2015-0843 — 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-2015-0843 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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A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.
- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
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