Security readout for executives and security teams
Plain-English summary
This flaw can let a remote unauthenticated attacker knock affected Cisco Catalyst access points offline or disrupt client traffic through them. The business risk is wireless service interruption, not data theft, because the stated impact is availability only.
Executive priority
High priority for environments dependent on Cisco wireless availability. The issue can disrupt access for users and connected services, but the provided sources do not indicate confidentiality or integrity impact.
Technical view
Cisco describes insufficient buffer allocation in packet processing for Embedded Wireless Controller Software on Catalyst APs. Crafted traffic can exhaust available resources, causing denial of service on the AP and client traffic traversing it. CVSS 3.1 is 8.6 with network, low-complexity, unauthenticated attack conditions.
Likely exposure
Organizations using Cisco Catalyst APs with Embedded Wireless Controller Software are the likely exposure group. Risk increases where affected APs can receive traffic from untrusted or poorly segmented networks. The source bundle does not provide exact affected version ranges.
Exploitation context
The provided sources support remote unauthenticated denial of service via crafted traffic. They do not report public exploitation, and KEV status is false. Treat this as a high-urgency availability issue rather than confirmed active exploitation.
Researcher notes
Key indicators are CVSS AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H and CWE-410. The bundle names insufficient buffer allocation and resource exhaustion but does not include affected version ranges, patches, workaround details, or exploit telemetry.
Mitigation direction
- Review Cisco’s advisory for affected releases and vendor-approved fixes or workarounds.
- Prioritize remediation for APs supporting business-critical wireless networks.
- Limit untrusted traffic paths to affected APs where network design allows.
- Monitor AP resource exhaustion, crashes, reboots, and client traffic disruption.
Validation and detection
- Inventory Catalyst APs running Embedded Wireless Controller Software.
- Map AP software versions against Cisco’s advisory before assigning exposure.
- Identify APs reachable from untrusted or guest network segments.
- Review wireless outage logs for unexplained AP DoS symptoms.
- Confirm remediation status after applying any Cisco-recommended update or workaround.
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-410: 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-2021-1615 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
- 8.6 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/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:L/PR:N/UI:N/S:C/C:N/I:N/A:H3.94Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
8.6HighVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Source materials
- CVE List V5 sourceCVE List V5
- 20210922 Cisco Embedded Wireless Controller Software for Catalyst Access Points 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.
Insufficient Resource Pool
Insufficient Resource Pool represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.