How severe is CVE-2026-22213?

CVE-2026-22213 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-22213 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (28th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-22213?

CVE-2026-22213 primarily affects Riot-os Riot. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-22213?

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

Does CVE-2026-22213 have an EU (EUVD) identifier?

Yes. CVE-2026-22213 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-2394.

When was CVE-2026-22213 published?

CVE-2026-22213 was published on 2026-01-12 and last updated on 2026-06-17.

CVE-2026-22213

CVE-2026-22213 is a critical-severity vulnerability in Riot-os Riot with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-121.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v4: 2.4
EPSS exploit prediction: 0% (28th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-2394
Weakness: CWE-121
Affected product: Riot-os Riot
Published: 2026-01-12
Last modified: 2026-06-17

Description

RIOT OS versions up to and including 2026.01-devel-317 contain a stack-based buffer overflow vulnerability in the tapslip6 utility. The vulnerability is caused by unsafe string concatenation in the devopen() function, which constructs a device path using unbounded user-controlled input. The utility uses strcpy() and strcat() to concatenate the fixed prefix '/dev/' with a user-supplied device name provided via the -s command-line option without bounds checking. This allows an attacker to supply an excessively long device name and overflow a fixed-size stack buffer, leading to process crashes and memory corruption.

Frequently asked questions

What is CVE-2026-22213?: RIOT OS versions up to and including 2026.01-devel-317 contain a stack-based buffer overflow vulnerability in the tapslip6 utility. The vulnerability is caused by unsafe string concatenation in the devopen() function, which constructs a device path using unbounded user-controlled input. The utility uses strcpy() and strcat() to concatenate the fixed prefix '/dev/' with a user-supplied device name provided via the -s command-line option without bounds checking. This allows an attacker to supply an excessively long device name and overflow a fixed-size stack buffer, leading to process crashes and memory corruption.
How severe is CVE-2026-22213?: CVE-2026-22213 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-22213 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (28th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-22213?: CVE-2026-22213 primarily affects Riot-os Riot. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-22213?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2026-22213 have an EU (EUVD) identifier?: Yes. CVE-2026-22213 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-2394.
When was CVE-2026-22213 published?: CVE-2026-22213 was published on 2026-01-12 and last updated on 2026-06-17.

References

Affected products (3)

cpe:2.3:o:riot-os:riot:*:*:*:*:*:*:*:*
cpe:2.3:o:riot-os:riot:2026.01:devel:*:*:*:*:*:*
cpe:2.3:o:riot-os:riot:2026.01:rc1:*:*:*:*:*:*

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