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CVE-2021-27562: Arm Trusted Firmware Out-of-Bounds Write Vulnerability

criticalknown exploitedCVE-2021-27562
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
Arm Trusted Firmware contains an out-of-bounds write vulnerability allowing the non-secure (NS) world to trigger a system halt, overwrite secure data, or print out secure data when calling secure functions under the non-secure processing environment (NSPE) handler mode. This vulnerability affects Yealink Device Management servers.

CSIRTS triage

vendor: Armproduct: Trusted FirmwareOther
What
The vulnerability allows out-of-bounds write that can trigger a system halt or overwrite secure data.
Who is affected
Yealink Device Management servers are affected.
Urgency
Immediate action is required due to active exploitation and critical severity.
Action
Apply the latest updates for Arm Trusted Firmware.

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Details

Source
CISA Known Exploited Vulnerabilities (US · database · site)
Severity
critical
Published
2021-11-03
Exploitation
Observed in the wild (CISA KEV)

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2021-27562

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2021-27562coverage & exploitation statusNVD · CVE.org

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