VulnerabilityPublished 20 May 2026

CVE-2026-20206: Cisco ThousandEyes Enterprise Agent · OS Command Injection

Affects Cisco ThousandEyes Enterprise AgentSource CVE Database V5

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Not known to be exploited · CVSS 6.3 Medium.

Data as of 30 Oct 2026, 11:52 UTC

CVSS 3.1 base score

6.3Medium

How severe the flaw is on the 0–10 CVSS scale.

EPSS: 0.4% chance of exploitation in 30 days – higher than 35% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L

Attack Vector: Network
Attack Complexity: Low
Privileges Required: Low
User Interaction: None
Scope: Unchanged
Confidentiality: Low
Integrity: Low
Availability: Low

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Network: The vulnerable component is bound to the network stack and the set of possible attackers extends beyond the other options listed, up to and including the entire Internet. Such a vulnerability is often termed 'remotely exploitable' and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).
Attack Complexity: Low: Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component.
Privileges Required: Low: The attacker is authorized with (i.e., requires) privileges that provide basic user capabilities that could normally affect only settings and files owned by a user. Alternatively, an attacker with Low privileges may have the ability to cause an impact only to non-sensitive resources.
User Interaction: None: The vulnerable system can be exploited without any interaction from any user.
Scope: Unchanged: An exploited vulnerability can only affect resources managed by the same security authority. In this case, the vulnerable component and the impacted component are either the same, or both are managed by the same security authority.
Confidentiality: Low: There is some loss of confidentiality. Access to some restricted information is obtained, but the attacker does not have control over what information is obtained, or the amount or kind of loss is limited. The information disclosure does not cause a direct, serious loss to the impacted component.
Integrity: Low: Modification of data is possible, but the attacker does not have control over the consequence of a modification, or the amount of modification is limited. The data modification does not have a direct, serious impact on the impacted component.
Availability: Low: Performance is reduced or there are interruptions in resource availability. Even if repeated exploitation of the vulnerability is possible, the attacker does not have the ability to completely deny service to legitimate users. The resources in the impacted component are either partially available all of the time, or fully available only some of the time, but overall there is no direct, serious consequence to the impacted component.

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 20 May 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 30 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Affected software

Product	Affected	Fixed in
CiscoCisco ThousandEyes Enterprise Agent	Affected Agent 4.0 – Agent 5.1.3 10 affected builds	Fixed in–

AI-suggested

Cisco has addressed this vulnerability in the Cisco ThousandEyes Enterprise Agent. According to the vendor advisory, no customer action is needed, indicating that the fix has been applied or the service has been updated accordingly.

Description

CVE-2026-20206 is a medium severity vulnerability in the BrowserBot component of Cisco ThousandEyes Enterprise Agent that allows an authenticated remote attacker to execute arbitrary OS commands within the BrowserBot container. The issue arises from insufficient input validation of user-supplied command arguments. Exploitation requires valid ThousandEyes SaaS credentials and the ability to manage transaction tests. Cisco has addressed this vulnerability in the product, and no customer action is required.

Impact

Successful exploitation could allow an attacker with valid credentials to execute arbitrary commands on the agent host within the BrowserBot container context, potentially impacting confidentiality, integrity, and availability of the affected system. The CVSS score is 6.3 (medium severity), reflecting network attack vector, low attack complexity, required privileges, and no user interaction.

Summary

This vulnerability in Cisco ThousandEyes Enterprise Agent's BrowserBot component involves improper neutralization of special elements in OS command inputs, enabling an authenticated attacker to execute arbitrary commands as the node user within the BrowserBot container. The attacker must authenticate to the ThousandEyes SaaS and submit crafted input to the affected parameter. The vulnerability affects multiple versions of the agent, including 4.0 through 5.1.3. Cisco has fixed the issue, and no further customer remediation is necessary.

References

sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-tebbot-cmdinj-wN3yQ5gn (opens in a new tab)

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 27 May 2026, 20:57 UTC

Technical details

References

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