Security readout for executives and security teams
Plain-English summary
CVE-2021-1569 affects Cisco Jabber desktop and mobile clients. It may let a low-privileged network attacker access sensitive information, and Cisco grouped it with Jabber issues that can also cause denial of service. The available bundle does not identify specific vulnerable versions or a named fix.
Executive priority
Handle through normal vulnerability management with elevated attention where Jabber carries sensitive business communications. Escalate only if Cisco guidance, telemetry, or later intelligence indicates exploit activity in your environment.
Technical view
The CVSS 3.1 vector is AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N, scored 6.5. The weakness is listed as CWE-399. The bundle names Cisco Jabber for Windows, Mac, and mobile platforms, but gives no version matrix, root cause detail, or patch identifiers.
Likely exposure
Exposure is most likely in organizations still running Cisco Jabber clients on Windows, macOS, or mobile devices. Version-level exposure cannot be determined from the provided bundle.
Exploitation context
No source in the bundle states active exploitation, and the CVE is not marked KEV. Exploitation requires network access and low privileges, with no user interaction according to the CVSS vector.
Researcher notes
Evidence is limited to the CVE metadata and Cisco advisory reference. Do not assume exact vulnerable versions, exploitability details, or fixed release numbers without consulting the vendor advisory directly.
Mitigation direction
- Review Cisco’s advisory for affected and fixed Jabber releases.
- Upgrade or retire affected Cisco Jabber clients per Cisco guidance.
- Prioritize endpoints used for sensitive communications or privileged workflows.
- Track remediation status across Windows, Mac, and mobile fleets.
Validation and detection
- Inventory Cisco Jabber installations across managed endpoints and mobile devices.
- Compare installed versions with Cisco’s advisory scope.
- Confirm vulnerable clients are updated, removed, or exception-tracked.
- Review security monitoring for unusual Jabber crashes or information exposure reports.
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-399: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. 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-2021-1569 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
- 20210616 Cisco Jabber Desktop and Mobile Client Software 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.
Resource Management Errors
Resource Management Errors represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.