zhayujie CowAgent up to 2.1.7 Bash Tool agent/tools/bash/bash.py denial of service

CVSS Meta Temp Score
CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.
Current Exploit Price (≈)
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CTI Interest Score
Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
3.9$0-$5k1.49+

Summaryinfo

A vulnerability marked as problematic has been reported in zhayujie CowAgent up to 2.1.7. Affected by this vulnerability is an unknown functionality of the file agent/tools/bash/bash.py of the component Bash Tool. The manipulation leads to denial of service. This vulnerability is listed as CVE-2026-84427. The attack may be initiated remotely. In addition, an exploit is available. The vendor was contacted early about this disclosure but did not respond in any way.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in zhayujie CowAgent up to 2.1.7. This issue affects an unknown code of the file agent/tools/bash/bash.py of the component Bash Tool. The manipulation with an unknown input leads to a denial of service vulnerability. Using CWE to declare the problem leads to CWE-404. The product does not release or incorrectly releases a resource before it is made available for re-use. Impacted is availability.

The advisory is shared at github.com. The identification of this vulnerability is CVE-2026-84427. The exploitation is known to be easy. The attack may be initiated remotely. Technical details as well as a public exploit are known. MITRE ATT&CK project uses the attack technique T1499 for this issue.

The exploit is available at github.com. It is declared as proof-of-concept. The vendor was contacted early about this disclosure but did not respond in any way.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Vendor

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.3
VulDB Meta Temp Score: 3.9

VulDB Base Score: 4.3
VulDB Temp Score: 3.9
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Denial of service
CWE: CWE-404
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Access: Public
Status: Proof-of-Concept
Download: 🔒
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Timelineinfo

09/01/2026 Advisory disclosed
09/01/2026 +0 days VulDB entry created
09/01/2026 +0 days VulDB entry last update

Sourcesinfo

Advisory: github.com
Status: Not defined

CVE: CVE-2026-84427 (🔒)
GCVE (CVE): GCVE-0-2026-84427
GCVE (VulDB): GCVE-100-397793
scip Labs: https://www.scip.ch/en/?labs.20161013

Entryinfo

Created: 09/01/2026 20:20
Changes: 09/01/2026 20:20 (56)
Complete: 🔍
Submitter: outlookgp
Cache ID: 216::103

Submitinfo

Accepted

  • Submit #884137: zhayujie CowAgent 2.1.3 Denial of Service (by outlookgp)

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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