Unified Communications ManagerApplication · Cisco
CVE-2021-1355
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 vulnerabilities in Cisco Unified Communications Manager IM & Presence Service (Unified CM IM&P) could allow an attacker to conduct path traversal attacks and SQL injection attacks on an affected system. One of the SQL injection vulnerabilities that affects Unified CM IM&P also affects Cisco Unified Communications Manager (Unified CM) and Cisco Unified Communications Manager Session Management Edition (Unified CM SME) and could allow an attacker to conduct SQL injection attacks on an affected system. For more information about these vulnerabilities, see the Details section of this advisory.
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 vulnerabilities in Cisco Unified Communications Manager IM & Presence Service allow path traversal and SQL injection attacks. One SQL injection also affects Unified CM and Unified CM SME. These vulnerabilities could allow authenticated attackers to access unauthorized files or execute arbitrary SQL commands on the underlying database.
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
Unified Communications ManagerApplication
< 11.5\(1\)su9>= 12.0, < 12.0\(1\)su4>= 12.5, < 12.5\(1\)su4
Unified Communications Manager Im And Presence ServiceApplication
< 11.5\(1\)su9>= 12.0, < 12.5\(1\)su4CVSS 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
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- None
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/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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Identify Unified CM versionLog into the Cisco Unified CM Administration interface and navigate to Help > About, or run 'show version' via CLI on the publisher serverAffected if Version is below 11.5(1)su9, or between 12.0(0) and 12.0(1)su3 inclusive, or between 12.5(0) and 12.5(1)su3 inclusive
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Identify IM & Presence Service versionLog into the Cisco Unified IM & Presence Administration interface and navigate to Help > About, or run 'show version' via CLI on the IM&P nodeAffected if Version is below 11.5(1)su9, or between 12.0(0) and 12.5(1)su3 inclusive
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Verify web admin interface accessibilityConfirm that the Cisco Unified CM or IM&P web administration interfaces (ports 8443 or 443) are reachable from network segments where untrusted users could operateAffected if Web interfaces are exposed to untrusted network segments without proper access controls
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Confirm administrative account exposureReview which user accounts have administrative or operator-level access to Unified CM or IM&P, and assess whether these credentials could be obtained by unauthorized actorsAffected if Administrative credentials are shared, default, or accessible to untrusted users
If either Unified CM or IM&P is running a version within the affected ranges AND the web administration interface is network-accessible to untrusted users, the environment is potentially affected by CVE-2021-1355.
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 data11.512.012.5
Apply Cisco-provided patches or upgrades to the affected Unified CM IM&P, Unified CM, and Unified CM SME installations. If patches are unavailable, implement network segmentation and restrict administrative access to limit attack surface.
Fix this in Unified Communications Manager
Scoped from the published advisory
- Consultation8.0 h
- Implementation16.0 h
- Testing12.0 h
- Review / QA6.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $11,776.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-1355 — 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-2021-1355 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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- 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
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