CVE-2026-22214Public exploitNetwork attack vector

Application crash via unbounded serial frame writes

Published Jan 12, 2026 · Updated Jan 12, 2026

Stack-based buffer overflow in RIOT OS through 2026.01-devel-317 allows attackers to crash ethos via crafted serial or TCP frames. The _handle_char() function writes each incoming byte to the fixed 9,000-byte serial->frame stack buffer and increments serial->framebytes without checking it against MTU. Reachability requires control of the serial stream or the TCP endpoint selected by ethos; overflowing the buffer corrupts memory and crashes the utility.

CVSS severity9.8
Critical
EPSS probability0.45%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack-based buffer overflow in RIOT OS through 2026.01-devel-317 allows attackers to crash ethos via crafted serial or TCP frames. The _handle_char() function writes each incoming byte to the fixed 9,000-byte serial->frame stack buffer and increments serial->framebytes without checking it against MTU. Reachability requires control of the serial stream or the TCP endpoint selected by ethos; overflowing the buffer corrupts memory and crashes the utility.

The record

CVE
CVE-2026-22214
Published
Jan 12, 2026
Updated
Jan 12, 2026
Vendor
RIOT-OS
Product
RIOT
Classifications
CWE-121, T1203
Attack vector
network
Privileges
Unavailable

Timeline

How it unfolded

  1. Jan 12, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 12, 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 <=2026.01-devel-317

What conditions does exploitation require?

Attack vectornetwork
Required privilegesUnavailable in this record.

What is affected?

RIOT-OS · RIOTversion=0 <=2026.01-devel-317

Published CVSS scores

9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
6.8VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:N/VI:N/VA:H/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

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

Weakness, pattern, technique

CWE-121Stack-based Buffer Overflow
T1203Exploitation for Client Execution

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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