Security readout for executives and security teams
Plain-English summary
This Cisco issue affects unified communications systems and may let a logged-in network attacker read sensitive data through path traversal or SQL injection. The public bundle rates it medium, but confidentiality impact is high, so exposed voice and collaboration infrastructure deserves prompt review.
Executive priority
Treat this as a medium-priority remediation with elevated attention for internet-facing, partner-accessible, or broadly reachable UC systems because sensitive communications data may be exposed.
Technical view
CVE-2021-1355 covers Cisco Unified CM IM&P path traversal and SQL injection issues; one SQL injection issue also affects Unified CM and Unified CM SME. CVSS 3.1 is 6.5: network reachable, low complexity, low privileges, no user interaction, high confidentiality impact.
Likely exposure
Likely exposure is organizations running Cisco Unified Communications Manager IM & Presence Service, Unified CM, or Unified CM SME in affected versions. The bundle does not provide exact vulnerable version ranges.
Exploitation context
The provided sources do not show CISA KEV listing or active exploitation. Exploitation requires network access and low privileges, with no user interaction, and is described as affecting confidentiality rather than integrity or availability.
Researcher notes
Evidence is limited to the CVE record and Cisco advisory reference. The bundle gives CWE-35 and CVSS details but not exact affected versions, fixed versions, exploit maturity, or detailed workaround text.
Mitigation direction
- Review Cisco advisory cisco-sa-imp-trav-inj-dM687ZD6 for affected releases.
- Apply Cisco-provided fixed software or remediation guidance where applicable.
- Prioritize systems reachable from broader enterprise or untrusted networks.
- Check vendor guidance before relying on compensating controls.
- Track remediation for Unified CM IM&P, Unified CM, and Unified CM SME separately.
Validation and detection
- Inventory Cisco Unified CM IM&P, Unified CM, and Unified CM SME deployments.
- Compare installed versions against Cisco advisory guidance.
- Confirm whether affected services are reachable over the network.
- Review access controls for low-privileged accounts on affected systems.
- Verify remediation status after vendor-guided updates or configuration changes.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-35: File access and web shell behavior lookup
File traversal and upload weaknesses can lead teams to review file, web shell, execution, and collection telemetry. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupDatabase behavior lookup
The CVE wording references database injection or access, so collection and exfiltration review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupFile access behavior lookup
The CVE wording references file access or upload behavior, so file telemetry and web shell review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2021-1355 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Medium
- CVSS
- 6.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N2.83.6Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
6.5MediumVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Source materials
- CVE List V5 sourceCVE List V5
- 20210120 Cisco Unified Communications Products VulnerabilitiesCVE reference · vendor-advisory, x_refsource_CISCO
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Path Traversal: '.../...//'
Path Traversal: '.../...//' represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.