Security readout for executives and security teams
Plain-English summary
This flaw lets an unauthenticated remote attacker read files from affected Cisco Unified Communications Manager systems through the TAPS interface. The main business risk is exposure of sensitive system files from voice infrastructure, not direct takeover or service disruption based on the provided sources.
Executive priority
Prioritize remediation for any exposed or business-critical Cisco UCM systems. The issue is high severity because it requires no authentication and can disclose arbitrary files, but sources do not indicate integrity impact, availability impact, or confirmed active exploitation.
Technical view
CVE-2020-3177 is a CWE-22 path traversal issue in Cisco UCM and UCM SME TAPS. Insufficient validation of user input can let a crafted request read arbitrary system files. CVSS 3.0 is 7.5 with network attack vector, low complexity, no privileges, and high confidentiality impact.
Likely exposure
Exposure is most likely where Cisco Unified Communications Manager or Session Management Edition has the TAPS interface reachable by untrusted networks. The source bundle does not provide affected version ranges, deployment defaults, or whether internet-facing instances are common.
Exploitation context
The provided sources describe remote unauthenticated exploitation by crafted request, but do not show active exploitation. The CVE is not marked KEV in the bundle, so this should be treated as a serious exposure risk rather than confirmed in-the-wild activity.
Researcher notes
Evidence is strong for the vulnerability class, attack vector, and confidentiality impact. The provided bundle is incomplete on exact affected versions, fixed versions, workarounds, and exploit prevalence. Avoid assuming broader Cisco products are affected without checking the vendor advisory.
Mitigation direction
- Review Cisco’s advisory for affected versions and fixed releases.
- Patch or upgrade affected Cisco UCM and UCM SME systems per vendor guidance.
- Restrict TAPS interface access to trusted management or voice networks.
- Monitor for suspicious requests to TAPS endpoints.
- Do not expose voice administration interfaces directly to the internet.
Validation and detection
- Inventory Cisco UCM and UCM SME deployments.
- Confirm whether TAPS is enabled and network-reachable.
- Compare installed versions against Cisco’s advisory.
- Review access logs for unusual TAPS requests.
- Validate compensating network controls around UCM interfaces.
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-22: 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 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-2020-3177 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
- High
- CVSS
- 7.5 (3.0)
- Known Exploited
- No
- Published
Vector: CVSS:3.0/AV:N/AC:L/PR:N/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:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N3.93.6Primary CVE scoreVulnerability scoring details
Base CVSS 3.0 score
7.5HighVector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Source materials
- CVE List V5 sourceCVE List V5
- 20200415 Cisco Unified Communications Manager Path Traversal VulnerabilityCVE 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.
Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.