How severe is CVE-2026-20167?

CVE-2026-20167 has a CVSS 3.x base score of 7.7, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2026-20167 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (20th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-20167?

CVE-2026-20167 affects Cisco Iot Field Network Director. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-20167?

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

Does CVE-2026-20167 have an EU (EUVD) identifier?

Yes. CVE-2026-20167 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-27850.

When was CVE-2026-20167 published?

CVE-2026-20167 was published on 2026-05-06 and last updated on 2026-06-30.

CVE-2026-20167

CVE-2026-20167 is a high-severity vulnerability in Cisco Iot Field Network Director with a CVSS 3.x base score of 7.7. 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-284.

Key facts

Severity: High (CVSS 3.x base score 7.7)
EPSS exploit prediction: 0% (20th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-27850
Weakness: CWE-284
Affected product: Cisco Iot Field Network Director
Published: 2026-05-06
Last modified: 2026-06-30

Description

A vulnerability in the web-based management interface of Cisco IoT Field Network Director could allow an authenticated, remote attacker with low privileges to cause a DoS condition on a remotely managed router. This vulnerability is due to improper error handling. An attacker could exploit this vulnerability by submitting crafted input to the web-based management interface. A successful exploit could allow the attacker to request unauthorized files from a remote router, causing the router to reload and resulting in a DoS condition.

Frequently asked questions

What is CVE-2026-20167?: A vulnerability in the web-based management interface of Cisco IoT Field Network Director could allow an authenticated, remote attacker with low privileges to cause a DoS condition on a remotely managed router. This vulnerability is due to improper error handling. An attacker could exploit this vulnerability by submitting crafted input to the web-based management interface. A successful exploit could allow the attacker to request unauthorized files from a remote router, causing the router to reload and resulting in a DoS condition.
How severe is CVE-2026-20167?: CVE-2026-20167 has a CVSS 3.x base score of 7.7, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2026-20167 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (20th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-20167?: CVE-2026-20167 affects Cisco Iot Field Network Director. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-20167?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-20167 have an EU (EUVD) identifier?: Yes. CVE-2026-20167 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-27850.
When was CVE-2026-20167 published?: CVE-2026-20167 was published on 2026-05-06 and last updated on 2026-06-30.

References

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iot-fnd-dos-n8N26Q4u

Affected products (1)

cpe:2.3:a:cisco:iot_field_network_director:*:*:*:*:*:*:*:*

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