How severe is CVE-2026-22321?

CVE-2026-22321 has a CVSS 3.x base score of 5.3, rated medium 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 low.

Is CVE-2026-22321 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (29th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-22321?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-22321 have an EU (EUVD) identifier?

Yes. CVE-2026-22321 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-12790.

When was CVE-2026-22321 published?

CVE-2026-22321 was published on 2026-03-18 and last updated on 2026-06-17.

CVE-2026-22321

CVE-2026-22321 is a medium-severity vulnerability with a CVSS 3.x base score of 5.3. 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: Medium (CVSS 3.x base score 5.3)
EPSS exploit prediction: 0% (29th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-12790
Weakness: CWE-121
Published: 2026-03-18
Last modified: 2026-06-17

Description

A stack-based buffer overflow in the device's Telnet/SSH CLI login routine occurs when a unauthenticated attacker send an oversized or unexpected username input. An overflow condition crashes the thread handling the login attempt, forcing the session to close. Because other CLI sessions remain unaffected, the impact is limited to a low‑severity availability disruption.

Frequently asked questions

What is CVE-2026-22321?: A stack-based buffer overflow in the device's Telnet/SSH CLI login routine occurs when a unauthenticated attacker send an oversized or unexpected username input. An overflow condition crashes the thread handling the login attempt, forcing the session to close. Because other CLI sessions remain unaffected, the impact is limited to a low‑severity availability disruption.
How severe is CVE-2026-22321?: CVE-2026-22321 has a CVSS 3.x base score of 5.3, rated medium 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 low.
Is CVE-2026-22321 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (29th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-22321?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-22321 have an EU (EUVD) identifier?: Yes. CVE-2026-22321 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-12790.
When was CVE-2026-22321 published?: CVE-2026-22321 was published on 2026-03-18 and last updated on 2026-06-17.

References

https://certvde.com/de/advisories/VDE-2025-104

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