Security readout for executives and security teams
Plain-English summary
Cisco NSO has a path traversal flaw in its web management interface and some HTTP APIs. An unauthenticated remote attacker could request files outside the intended path and read sensitive data. Cisco released software updates and states there are no workarounds.
Executive priority
Prioritize remediation for exposed NSO management planes because the bug allows unauthenticated data access. It is not currently evidenced as actively exploited, so urgency is moderate unless exposure is public or sensitive files are reachable.
Technical view
CVE-2021-1132 is CWE-35 in Cisco Network Services Orchestrator input validation for HTTP requests. Affected listed versions include 5.3.1, 5.4, 5.4.0.1, and 5.4.0.2. CVSS 3.1 is 5.3: network exploitable, low complexity, no privileges, no user interaction, confidentiality impact only.
Likely exposure
Exposure is limited to organizations running affected Cisco NSO versions with the web management interface or HTTP-based APIs reachable by untrusted users or networks.
Exploitation context
The provided sources do not show CISA KEV listing or active exploitation. The flaw is remotely reachable and unauthenticated, but the documented impact is limited to reading sensitive files, not code execution or service disruption.
Researcher notes
The source bundle names vulnerable versions and the attack class but does not include exploit telemetry, proof-of-concept status, or fixed version details. Avoid assuming broader Cisco products are affected; unrelated Cisco advisory URLs appear in the bundle.
Mitigation direction
- Apply Cisco software updates that address CVE-2021-1132.
- Check Cisco guidance for the exact fixed NSO release path.
- Do not rely on a workaround; Cisco states none exists.
- Limit management and API reachability while updates are planned.
Validation and detection
- Inventory Cisco NSO deployments and record exact versions.
- Flag NSO 5.3.1, 5.4, 5.4.0.1, and 5.4.0.2.
- Confirm web management and HTTP APIs are not internet exposed.
- Verify updated systems no longer run affected releases.
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 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-2021-1132 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
- 5.3 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N/RL:X/RC:X/E:X
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:N/UI:N/S:U/C:L/I:N/A:N/RL:X/RC:X/E:X3.91.4Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
5.3MediumVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N/RL:X/RC:X/E:X
Source materials
- CVE List V5 sourceCVE List V5
- cisco-sa-nso-path-trvsl-dZRQE8LcCVE reference
- https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-webex-distupd-N87eB6Z3CVE reference
- https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ipphone-rce-dos-U2PsSkz3CVE reference
- https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-snort-ethernet-dos-HGXgJH8nCVE reference
- https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwanvman-infodis1-YuQScHBCVE reference
- https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-vmaninfdis3-OvdR6uu8CVE reference
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.