CVE-2015-7763
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 · uneditedrx/rx.c in OpenAFS 1.5.75 through 1.5.78, 1.6.x before 1.6.15, and 1.7.x before 1.7.33 does not properly initialize padding at the end of an Rx acknowledgement (ACK) packet, which allows remote attackers to obtain sensitive information by (1) conducting a replay attack or (2) sniffing the network.
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 · high confidenceOpenAFS fails to initialize padding bytes at the end of Rx acknowledgement (ACK) packets in rx/rx.c, causing uninitialized memory contents to be transmitted. This information leakage allows remote attackers to conduct replay attacks or perform network sniffing to obtain sensitive data.
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= 1.5.75= 1.5.76= 1.5.77= 1.5.78= 1.6.0= 1.6.1= 1.6.2= 1.6.2.1= 1.6.3= 1.6.4= 1.6.5= 1.6.5.1CVSS 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
- None
- Availability
- None
AV:N/AC:L/Au:N/C:P/I:N/A:N
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 OpenAFS is installedRun 'rpm -q openafs' or 'dpkg -l | grep openafs' or check for the presence of /usr/vice/etc/ThisCell and afsd binaryAffected if OpenAFS package is not found - the system is not using OpenAFS, so not affected by this CVE
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Determine installed OpenAFS versionRun 'rxstat -version' or 'afsd -version' or query package manager with 'rpm -q openafs --qf "%{VERSION}-%{RELEASE}"'Affected if The installed version falls within 1.5.75 through 1.6.5.1 (including 1.5.75, 1.5.76, 1.5.77, 1.5.78, 1.6.0, 1.6.1, 1.6.2, 1.6.2.1, 1.6.3, 1.6.4, 1.6.5, 1.6.5.1)
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Verify Rx service is runningRun 'ps aux | grep afsd' or check if port 7000-7007 (AFS/Rx ports) are open with 'netstat -an | grep 700' or check for rxdaemon processAffected if The OpenAFS server or client daemon (afsd/rxdaemon) is running and processing Rx protocol packets - only then would the uninitialized padding be transmitted
The system is affected only if OpenAFS is installed with a version between 1.5.75 and 1.6.5.1 and the OpenAFS daemon (client or server) is actively running to transmit the vulnerable Rx ACK packets.
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 to OpenAFS 1.6.15+, 1.7.33+, or later versions that contain the fix for proper padding initialization in Rx ACK packets.
- Consultation4.0 h
- Implementation8.0 h
- Testing6.0 h
- Review / QA3.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2015-7763 — 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-2015-7763 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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