CVE-2026-84427Public exploitNetwork attack vectorHinoki check available

Service crash via unbounded command-output buffering

Published Sep 2, 2026 · Updated Sep 2, 2026

Denial of service in the Bash Tool in zhayujie CowAgent 2.1.0 through 2.1.7 allows remote authenticated users to crash the service. Bash.execute captures command output through unbounded stdout and stderr pipes, so a high-output command can exhaust process memory. Exploitation requires access to an agent-enabled interface and interrupts CowAgent without reported confidentiality or integrity impact.

CVSS severityUnavailable
Unscored
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Denial of service in the Bash Tool in zhayujie CowAgent 2.1.0 through 2.1.7 allows remote authenticated users to crash the service. Bash.execute captures command output through unbounded stdout and stderr pipes, so a high-output command can exhaust process memory. Exploitation requires access to an agent-enabled interface and interrupts CowAgent without reported confidentiality or integrity impact.

The record

CVE
CVE-2026-84427
Published
Sep 2, 2026
Updated
Sep 2, 2026
Vendor
zhayujie
Product
CowAgent
Classifications
CWE-404, T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 2, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 2, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=2.1.0
  2. Affected versionversion=2.1.1
  3. Affected versionversion=2.1.2
  4. Affected versionversion=2.1.3
  5. Affected versionversion=2.1.4
  6. Affected versionversion=2.1.5
  7. Affected versionversion=2.1.6
  8. Affected versionversion=2.1.7

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

zhayujie · CowAgentversion=2.1.0; version=2.1.1; version=2.1.2; version=2.1.3; version=2.1.4; version=2.1.5; version=2.1.6; version=2.1.7

Published CVSS scores

4.3VulDB CNACVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:P/RL:X/RC:R
5.3VulDB CNACVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P
4.0VulDB CNAAV:N/AC:L/Au:S/C:N/I:N/A:P/E:POC/RL:ND/RC:UR
4.3VulDB CNACVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:P/RL:X/RC:R

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-404Improper Resource Shutdown or Release
T1499.004Endpoint Denial of Service: Application or System Exploitation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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