Cisco Aironet Access Points FlexConnect Upgrade Information Disclosure Vulnerability
Priority MEDIUM 42CWE-275Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- High · None · None
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA.
Summary
A vulnerability in the FlexConnect Upgrade feature of Cisco Aironet Series Access Points Software could allow an unauthenticated, remote attacker to obtain confidential information from an affected device. This vulnerability is due to an unrestricted Trivial File Transfer Protocol (TFTP) configuration. An attacker could exploit this vulnerability by sending a specific TFTP request to an affected device. A successful exploit could allow the attacker to download any file from the filesystem of the affected access point (AP).
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.01548 75th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Cisco | Cisco Aironet Access Point Software | all versions | — | No fix listed | CNA |
- Cisco Aironet Access Point Software VendorCisco Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 14
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:cisco:aironet_access_point_software:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | Cisco |
| cpe:2.3:h:cisco:1100_integrated_services_router:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:h:cisco:aironet_1540:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:h:cisco:aironet_1560:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:h:cisco:aironet_1800:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:h:cisco:aironet_2800:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:h:cisco:aironet_3800:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:h:cisco:aironet_4800:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:h:cisco:catalyst_9100:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:h:cisco:catalyst_iw6300:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
- cpe:2.3:a:cisco:aironet_access_point_software:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·Cisco
- cpe:2.3:h:cisco:1100_integrated_services_router:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:h:cisco:aironet_1540:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:h:cisco:aironet_1560:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:h:cisco:aironet_1800:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:h:cisco:aironet_2800:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:h:cisco:aironet_3800:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:h:cisco:aironet_4800:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:h:cisco:catalyst_9100:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:h:cisco:catalyst_iw6300:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
Show 4 more CPE
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:h:cisco:esw6300:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:catalyst_9800_firmware:*:*:*:*:*:*:*:* | 17.1 to before 17.3.3 | Vulnerable | Cisco |
| cpe:2.3:h:cisco:catalyst_9800:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:a:cisco:wireless_lan_controller_software:*:*:*:*:*:*:*:* | 8.10.112.0 to before 8.10.142.0 | Vulnerable | Cisco |
- cpe:2.3:h:cisco:esw6300:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:catalyst_9800_firmware:*:*:*:*:*:*:*:* Versions 17.1 to before 17.3.3 Vulnerable ·Cisco
- cpe:2.3:h:cisco:catalyst_9800:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:a:cisco:wireless_lan_controller_software:*:*:*:*:*:*:*:* Versions 8.10.112.0 to before 8.10.142.0 Vulnerable ·Cisco
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2021-1437
- 2026-10-03 Alias added: GHSA-777j-pmq7-4px5
References
More Cisco Aironet Access Point Software vulnerabilities
- TI-2018-00197 Improper input validation in Cisco Aironet 1810, 1830, and 1850 Series Access Points CVSS 3.0HIGH 8.6
- TI-2017-02928 Access control flaw in Cisco Mobility Express 1800 Access Point Series CVSS 3.0CRITICAL 9.8
- TI-2022-05181 Cisco Embedded Wireless Controller with Catalyst Access Points IP Flood Denial of Service Vulnerability CVSS 3.1HIGH 8.6
- TI-2020-03104 Cisco Aironet Access Points UDP Flooding Denial of Service Vulnerability CVSS 3.1HIGH 8.6
- TI-2020-03103 Cisco Aironet Access Point Authentication Flood Denial of Service Vulnerability CVSS 3.1HIGH 8.6
- TI-2015-05351 Cisco Aironet 1800 devices with software 8.1(131.0) allow remote attackers to cause a… CVSS 2.0HIGH 7.8
Sources
- CVE-2021-1437 · CVE Program
- CVE-2021-1437 · NVD
- FIRST EPSS
- GHSA-777j-pmq7-4px5 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences