How severe is CVE-2020-27891?

CVE-2020-27891 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2020-27891 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (70th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-27891?

CVE-2020-27891 affects Ti Z-stack. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-27891?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2020-27891 published?

CVE-2020-27891 was published on 2020-10-27 and last updated on 2026-06-17.

CVE-2020-27891

CVE-2020-27891 is a high-severity vulnerability in Ti Z-stack with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 1% (70th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Ti Z-stack
Published: 2020-10-27
Last modified: 2026-06-17

Description

The Zigbee protocol implementation on Texas Instruments CC2538 devices with Z-Stack 3.0.1 does not properly process a ZCL Read Reporting Configuration Response message. It crashes in zclHandleExternal().

Frequently asked questions

What is CVE-2020-27891?: The Zigbee protocol implementation on Texas Instruments CC2538 devices with Z-Stack 3.0.1 does not properly process a ZCL Read Reporting Configuration Response message. It crashes in zclHandleExternal().
How severe is CVE-2020-27891?: CVE-2020-27891 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2020-27891 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (70th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-27891?: CVE-2020-27891 affects Ti Z-stack. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-27891?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2020-27891 published?: CVE-2020-27891 was published on 2020-10-27 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:ti:z-stack:3.0.1:*:*:*:*:*:*:*

More vulnerabilities in Ti Z-stack

CVE-2020-27890 — High (CVSS 8.2): The Zigbee protocol implementation on Texas Instruments CC2538 devices with Z-Stack 3.0.1 does not properly process a…
CVE-2020-27892 — High (CVSS 7.5): The Zigbee protocol implementation on Texas Instruments CC2538 devices with Z-Stack 3.0.1 does not properly process a…
CVE-2020-16630 — Medium (CVSS 6.8): TI’s BLE stack caches and reuses the LTK’s property for a bonded mobile. A LTK can be an…

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