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Silc ServerApplication · Silc

CVE-2007-1327

HIGH · 7.8 CVSS v2.0 Published 2007-03-07
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
87/100
Remediation priority · High
Remotely reachable No privileges Zero-click

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 · unedited
The SILC_SERVER_CMD_FUNC function in apps/silcd/command.c in silc-server 1.0.2 allows remote attackers to cause a denial of service (NULL dereference and daemon crash) via a request without a cipher algorithm and an invalid HMAC algorithm.

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 confidence

The SILC_SERVER_CMD_FUNC function in apps/silcd/command.c of silc-server 1.0.2 suffers from a NULL pointer dereference when processing requests that omit a cipher algorithm and supply an invalid HMAC algorithm. The function fails to validate these algorithm parameters before dereferencing them, causing the daemon to crash.

MitigationIf silc-server is still in use, apply any available patches from the vendor. Otherwise, migrate to a supported secure chat/communication server solution, as silc-server 1.0.2 is legacy software from 2007.

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
Silc ServerApplication
Affected:= 1.0.2

CVSS 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
None
Integrity
None
Availability
Complete

AV:N/AC:L/Au:N/C:N/I:N/A:C

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 checks

Work through these to decide whether this CVE applies to you.

  1. Check if Silc Server is installed
    Run 'rpm -q silc-server' or 'dpkg -l | grep silc' or check for /usr/sbin/silcd binary
    Affected if silc-server package or binary exists on the system
  2. Verify the installed version is 1.0.2
    Run 'silcd --version' or check package metadata with 'rpm -qi silc-server' or 'dpkg -s silc-server'
    Affected if Version reported is exactly 1.0.2
  3. Check if silc-server daemon is running
    Run 'ps aux | grep silcd' or 'systemctl status silcd'
    Affected if The silcd process is actively running and accepting connections
  4. Review logs for crash events
    Check /var/log/messages, /var/log/syslog, or application-specific logs for segmentation faults or unexpected silcd daemon restarts
    Affected if Logs show silcd crashes or frequent restarts around the time of connection requests

System is affected only if silc-server version 1.0.2 is installed, the daemon is running and accepting connections, and crash events matching the described NULL pointer dereference pattern are present in logs.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

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 data
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

If silc-server is still in use, apply any available patches from the vendor. Otherwise, migrate to a supported secure chat/communication server solution, as silc-server 1.0.2 is legacy software from 2007.

Fix this in Silc Server Scoped from the published advisory
  • Consultation2.0 h
  • Implementation4.0 h
  • Testing3.0 h
  • Review / QA2.0 h
11.0 hours of engineering $1,930
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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2007-1327 in production — separate from our analysis above.

No notes yet

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What this is

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.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
  • No weaponised exploit code, or anything meant to cause harm
  • No spam, self-promotion, credentials, or personal data