Security readout for executives and security teams
Plain-English summary
This flaw can let a low-privileged local authenticated user crash certain Cisco collaboration endpoints. The expected business impact is temporary device outage, not data theft. The device reportedly recovers after reboot, but outages can disrupt meeting rooms and executive communications.
Executive priority
Treat as a moderate operational availability issue. Prioritize remediation for boardrooms, executive suites, incident-response rooms, and other high-value meeting spaces where device reloads could disrupt business-critical communications.
Technical view
CVE-2021-34758 is a CWE-732 access-control weakness in shared memory handling for Cisco TelePresence CE and RoomOS software. A local authenticated attacker could corrupt a shared memory segment and trigger device reload. CVSS 3.1 is 4.4, with low integrity and availability impact and no confidentiality impact stated.
Likely exposure
Exposure is mainly organizations operating Cisco RoomOS or TelePresence Collaboration Endpoint devices where non-admin local authenticated users can access affected systems. The provided evidence does not support broad unauthenticated remote exposure.
Exploitation context
The source bundle does not show CISA KEV listing or public active exploitation evidence. Exploitation requires local access and low privileges, which reduces internet-scale risk but remains relevant for shared rooms, managed endpoints, or environments with weak local account controls.
Researcher notes
The core issue is insufficient access control on a shared memory resource. The bundle lacks specific affected version ranges, fixed releases, proof-of-concept status, and workaround details, so version validation should be anchored to Cisco's advisory rather than inferred.
Mitigation direction
- Review Cisco's advisory for affected and fixed software details.
- Apply vendor-recommended software updates when available.
- Restrict local authenticated access to trusted administrators only.
- Remove unnecessary local accounts on collaboration endpoints.
- Monitor affected devices for unexpected reloads or recurring outages.
Validation and detection
- Inventory Cisco RoomOS and TelePresence Collaboration Endpoint devices.
- Compare installed software versions with Cisco advisory guidance.
- Review local account and privilege assignments on endpoints.
- Check device uptime or logs for unexplained reload events.
- Confirm remediation status in vulnerability management records.
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-732: Authorization and privilege behavior lookup
Authorization weaknesses can support privilege escalation and valid-account review, depending on exploit path. 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 lookupCVE-2021-34758 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
- 4.4 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L
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:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L1.82.5Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
4.4MediumVector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L
Source materials
- CVE List V5 sourceCVE List V5
- 20211006 Cisco TelePresence Collaboration Endpoint and RoomOS Software Denial of Service 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.
Incorrect Permission Assignment for Critical Resource
Incorrect Permission Assignment for Critical Resource represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.