How severe is CVE-2026-20199?

CVE-2026-20199 has a CVSS 3.x base score of 4.7, rated medium severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability low.

Is CVE-2026-20199 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (35th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-20199?

CVE-2026-20199 affects Cisco Thousandeyes Virtual Appliance. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-20199?

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

Does CVE-2026-20199 have an EU (EUVD) identifier?

Yes. CVE-2026-20199 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-31137.

When was CVE-2026-20199 published?

CVE-2026-20199 was published on 2026-05-20 and last updated on 2026-06-30.

CVE-2026-20199

CVE-2026-20199 is a medium-severity vulnerability in Cisco Thousandeyes Virtual Appliance with a CVSS 3.x base score of 4.7. 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-74.

Key facts

Severity: Medium (CVSS 3.x base score 4.7)
EPSS exploit prediction: 0% (35th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-31137
Weakness: CWE-74
Affected product: Cisco Thousandeyes Virtual Appliance
Published: 2026-05-20
Last modified: 2026-06-30

Description

A vulnerability in the SSL certificate handling of Cisco ThousandEyes Virtual Appliance could allow an authenticated, remote attacker to execute commands on the underlying operating system as the root user. This vulnerability is due to insufficient validation of user-supplied input. An authenticated attacker could exploit this vulnerability by uploading a crafted certificate to an affected device. A successful exploit could allow the attacker to execute arbitrary code as the root user on the underlying operating system. To exploit this vulnerability, the attacker must have valid administrative credentials.

Frequently asked questions

What is CVE-2026-20199?: A vulnerability in the SSL certificate handling of Cisco ThousandEyes Virtual Appliance could allow an authenticated, remote attacker to execute commands on the underlying operating system as the root user. This vulnerability is due to insufficient validation of user-supplied input. An authenticated attacker could exploit this vulnerability by uploading a crafted certificate to an affected device. A successful exploit could allow the attacker to execute arbitrary code as the root user on the underlying operating system. To exploit this vulnerability, the attacker must have valid administrative credentials.
How severe is CVE-2026-20199?: CVE-2026-20199 has a CVSS 3.x base score of 4.7, rated medium severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability low.
Is CVE-2026-20199 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (35th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-20199?: CVE-2026-20199 affects Cisco Thousandeyes Virtual Appliance. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-20199?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-20199 have an EU (EUVD) identifier?: Yes. CVE-2026-20199 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-31137.
When was CVE-2026-20199 published?: CVE-2026-20199 was published on 2026-05-20 and last updated on 2026-06-30.

References

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-tevacert-rce-RMJVEym5

Affected products (1)

cpe:2.3:a:cisco:thousandeyes_virtual_appliance:*:*:*:*:*:*:*:*

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