✕

Rewterz Annual Threat Intelligence Report 2025 - Download Now

Request a Demo
Rewterz

Rewterz Threat Alert – Phobos Ransomware – Active IOCs

September 28, 2022
Rewterz

Rewterz Threat Advisory – Multiple Cisco Nexus Products Vulnerabilities

September 28, 2022

Rewterz Threat Advisory – Multiple Cisco Products Vulnerabilities

Severity

Medium

Analysis Summary

CVE-2022-20728 CVSS:4.7

Cisco Access Points could allow a remote attacker to bypass security restrictions, caused by a logic error on the AP. By obtaining access to the native VLAN and directing traffic directly to the client through their MAC/IP combination, an attacker could exploit this vulnerability to bypass VLAN separation and potentially also bypass any Layer 3 protection mechanisms.

CVE-2021-27854 CVSS:4.7

Multiple Cisco Products could allow a remote attacker to bypass security restrictions, caused by a flaw in the processing of stacked Ethernet tag headers. By sending a specially-crafted request using a combination of VLAN 0 headers, LLC/SNAP headers, and converting frames, an attacker could exploit this vulnerability to bypass layer 2 network filtering capabilities such as IPv6 RA guard.

Impact

Security Bypass

Indicators Of Compromise

CVE

  • CVE-2022-20728
  • CVE-2021-27854

Affected Vendors

Cisco

Affected Products

  • Cisco Aironet 1800 Series Access Point
  • Cisco Aironet 3800 Series Access Point
  • Cisco Aironet 1560 Series Access Point
  • Cisco Aironet 1540 Series Access Point

Remediation

Refer to Cisco Security Advisory for patch, upgrade or suggested workaround information.

Cisco Security Advisory

Reading this advisory was a good start.

Make it a habit.

Rewterz publishes threat advisories ahead of mainstream cybersecurity media, informed by an AI-Native Autonomous SOC that sees regional threat actor activity in real time. Subscribe to receive each new advisory as it publishes, plus a monthly Middle East threat landscape brief drawn from our own SOC telemetry. For teams evaluating their detection coverage, a 30-minute consultation with a senior analyst is also available, at your pace, when you're ready.

Request a demo