CVE-2026-22211Public exploit

Device crash via unbounded printfUART string expansion

Published Jan 14, 2026 · Updated Jan 14, 2026

Global buffer overflow in TinyOS 2.1.2 and earlier allows local users to crash devices via an oversized printfUART string. The custom formatter appends each %s argument with strcat into the 256-byte global debugbuf without checking its remaining capacity. Reachability requires local code to pass a caller-controlled string to printfUART; corruption can also alter adjacent global state or UART output.

CVSS severity5.1
Medium
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Global buffer overflow in TinyOS 2.1.2 and earlier allows local users to crash devices via an oversized printfUART string. The custom formatter appends each %s argument with strcat into the 256-byte global debugbuf without checking its remaining capacity. Reachability requires local code to pass a caller-controlled string to printfUART; corruption can also alter adjacent global state or UART output.

The record

CVE
CVE-2026-22211
Published
Jan 14, 2026
Updated
Jan 14, 2026
Vendor
TinyOS
Product
TinyOS
Classifications
CWE-787, T1499
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 14, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 14, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=2.1.2

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

TinyOS · TinyOSversion=0 <=2.1.2

Published CVSS scores

5.1VulnCheckCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-787Out-of-bounds Write
T1499Endpoint Denial of Service

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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