Security readout for executives and security teams
Plain-English summary
CVE-2020-3353 can let an unauthenticated remote attacker disrupt Cisco Identity Services Engine by overwhelming its syslog processing. A successful attack crashes the Application Server process, causing a denial of service. The source bundle does not identify affected versions or a specific fix.
Executive priority
Treat this as a moderate availability risk for identity infrastructure. Prioritize validation where Cisco ISE supports access control, authentication, or network admission workflows, because outage impact may exceed the CVSS score.
Technical view
The vulnerability is a race condition in Cisco ISE syslog message processing, mapped to CWE-362. It is network-reachable, requires no privileges or user interaction, and affects availability only. CVSS 3.1 is 5.9 because exploitation has high complexity but can cause high availability impact.
Likely exposure
Exposure is likely limited to Cisco ISE Software deployments that receive syslog traffic from reachable network sources. Version-level exposure cannot be determined from the provided bundle because affected versions are listed only as n/a.
Exploitation context
The bundle does not show CISA KEV listing or evidence of active exploitation. The described attack depends on triggering a race condition through a high rate of syslog messages, so practical risk depends on syslog exposure and traffic controls.
Researcher notes
Evidence is limited to the CVE summary and Cisco advisory reference. Do not assume affected versions, exploit availability, or remediation details beyond vendor guidance. The key research focus is syslog reachability, race-condition crash evidence, and vendor-confirmed patch status.
Mitigation direction
- Review Cisco advisory cisco-sa-ise-dos-qNzq39K7 for fixed releases or workarounds.
- Identify all Cisco ISE deployments that process syslog messages.
- Limit syslog submission to trusted sources where operationally feasible.
- Apply vendor-supported updates or mitigations if Cisco lists them.
- Monitor ISE Application Server crashes and availability events.
Validation and detection
- Confirm whether deployed Cisco ISE versions match Cisco advisory affected ranges.
- Map which networks and hosts can send syslog traffic to ISE.
- Review ISE logs for Application Server restarts or crash patterns.
- Check monitoring for unexplained ISE availability drops since June 3, 2020.
- Document compensating controls if patch status cannot be confirmed.
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-362: 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-2020-3353 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
- 5.9 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
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:H/PR:N/UI:N/S:U/C:N/I:N/A:H2.23.6Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
5.9MediumVector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Source materials
- CVE List V5 sourceCVE List V5
- 20200603 Cisco Identity Services Engine 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.
Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.