Home/CVE/A replay attack vulnerability was discovered in a Zigbee smart home kit manufactured by Ksix (Zigbee Gateway Module = v1
CVE
CVE-2021-27289
A replay attack vulnerability was discovered in a Zigbee smart home kit manufactured by Ksix (Zigbee Gateway Module = v1
A replay attack vulnerability was discovered in a Zigbee smart home kit manufactured by Ksix (Zigbee Gateway Module = v1.0.3, Door Sensor = v1.0.7, Motion Sensor = v1.0.12), where the Zigbee anti-replay mechanism - based on the frame counter field - is improperly implemented. As a result, an attacker within wireless range can resend captured packets with a higher sequence number, which the devices incorrectly accept as legitimate messages. This allows spoofed commands to be injected without authentication, triggering false alerts and misleading the user through notifications in the mobile application used to monitor the network.
CRITICAL · CVSS 9.1
EPSS 0.00484
Act now
- Public exploit or PoC is available
- SSVC automatable: yes - attacks can be scripted at scale
- CVSS base score ≥ 7.0
Sigma rules0
YARA rules0
Look this up elsewhere - one-click external pivots
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How to read a CVE - triage first, then detect and patch
This page is every public fact about CVE-2021-27289, cross-linked. Its job is to answer one question fast - does this need my attention now? - and then hand you the two things you do about it. Here is how an analyst reads it.
Triage: should I act now? Four signals, and they are not interchangeable:
CVSSseverity - how bad it is IF exploited, 0-10. A high CVSS alone is not urgency; a flaw can be a perfect 10 and never actually be attacked.
EPSSprobability - a model’s estimate of the chance it is exploited in the next 30 days, 0-1. This is the “will it actually happen” signal.
CISA KEVconfirmed - it is being exploited in the wild right now. The strongest signal on the page; KEV beats any score.
Weaponisedavailability - public exploits / PoCs, and especially Metasploit modules rated Excellent / Great. Reliable, packaged exploit code means low-skill attackers can use it today.
How they combine: KEV, or a dependable Metasploit module, means patch now regardless of CVSS. High CVSS + low EPSS + no exploit is real but not an emergency - schedule it. Low CVSS but KEV-listed still gets patched now. The verdict above already weighed these for you; this is how it got there.
Then what - two workflows:
Detectwhen you cannot patch today, follow this CVE to the ATT&CK techniques it enables, then Build a SIEM detection (the green button) - author a rule, test it in Atomic, deploy it. That buys visibility while the patch waits.
PatchAffected products / packages tell you if you are exposed; Fixed versions by distribution and Vendor advisories give the exact version that closes it.
Reading order for the panels below: verdict + badges, then Public exploits / Metasploit (is it weaponised), then ATT&CK techniques + Sigma / IDS rules (can I detect it), then Affected products / packages + Fixed versions (am I exposed, what patches it), then Threat actors / IOCs (who uses it), then Scoring & timeline / references (the evidence).
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ATT&CK techniques
11Techniques this CVE enables - linked via CWECAPECATT&CK. High◆ = named directly in ATT&CK or Nuclei templates.
T1021 · Remote Services T1021.002 · SMB/Windows Admin Shares T1114.002 · Remote Email Collection T1133 · External Remote Services T1134.001 · Token Impersonation/Theft T1550.002 · Pass the Hash T1550.003 · Pass the Ticket T1550.004 · Web Session Cookie T1557 · Adversary-in-the-Middle T1558 · Steal or Forge Kerberos Tickets T1558.003 · Kerberoasting
▤ Build a SIEM detection for these techniques
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CAPEC attack patterns
10Attack patterns this CVE enables - the bridge from weakness to ATT&CK technique.
CAPEC-CAPEC-102 · Session Sidejacking CAPEC-CAPEC-509 · Kerberoasting CAPEC-CAPEC-555 · Remote Services with Stolen Credentials CAPEC-CAPEC-561 · Windows Admin Shares with Stolen Credentials CAPEC-CAPEC-60 · Reusing Session IDs (aka Session Replay) CAPEC-CAPEC-644 · Use of Captured Hashes (Pass The Hash) CAPEC-CAPEC-645 · Use of Captured Tickets (Pass The Ticket) CAPEC-CAPEC-652 · Use of Known Kerberos Credentials CAPEC-CAPEC-701 · Browser in the Middle (BiTM) CAPEC-CAPEC-94 · Adversary in the Middle (AiTM)
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Weakness Classification
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Public Exploits & PoCs
5These PoC and exploit links come from public sources and are not verified to be safe or functional. Review the code before running anything, and treat unverified entries as untrusted.
pocpacketstormsecurity.com · Ksix-Zigbee-Devices-Playback-Protection-Bypass.htmlpacketstormsecurity.com
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Scoring & Timeline
9.1
CRITICAL · CVSS v3.1 · [email protected]
Attack Vector
Network
Adjacent
Local
Physical
Attack Complexity
Low
High
Privileges Required
None
Low
High
User Interaction
None
Required
Scope
Unchanged
Changed
Confidentiality
None
Low
High
Integrity
None
Low
High
Availability
None
Low
High
SSVC triage · cisa-vulnrichment
Exploitation
none
Automatable
yes
Technical impact
partial
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
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References & Sources
3Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.