CVE-2021-27289

Exploitation

Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.

SSVC decision

• ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
• AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
• Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

0.82% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 54.6% of scored records. A rank, not a probability.

NVD base score

9.1 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

NVD analysis status

Deferred. NVD last modified this record on 2026-06-17.

Red Hat severity

No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2025-04-15 00:00Z1 YR AGO

Last updated

2025-04-16 14:25Z1 YR AGO

Reserved

2021-02-16

Assigning CNA

mitre

Record state

PUBLISHED

Severity

Critical (CVSS 9.1)

CNA CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

Weaknesses

• CWE-294Authentication Bypass by Capture-replayBase

Data version

5.1

Document digest

a0fc571418580680ca078e9e4ca879a472b27d41e5a1d3265596af3c4b1079a9

• www.exploit-db.comhttps://www.exploit-db.com/exploits/49169
• www.youtube.comhttps://www.youtube.com/watch?v=5IFUpRKEioA
• www.youtube.comhttps://www.youtube.com/watch?v=XFOy3wSlC9Q
• www.youtube.comhttps://www.youtube.com/watch?v=yc9IEt5IMmA
• packetstormsecurity.comhttps://packetstormsecurity.com/files/160331/Ksix-Zigbee-Devices-Playback-Protection-Bypass.html
• github.comhttps://github.com/TheMalwareGuardian/CVE-2021-27289