CVE-2023-38865Public exploitNetwork attack vector

Unauthenticated command execution via timestr injection

Published Aug 15, 2023 · Updated Oct 9, 2024

Command injection in COMFAST CF-XR11 firmware 2.7.2 allows remote attackers to execute arbitrary commands through a crafted HTTP POST request. The sub_4143F0 handler in /usr/bin/webmgnt processes the POST-supplied timestr value in a way that permits embedded shell syntax to execute. No authentication or user interaction is required, and successful exploitation grants a shell on the router.

CVSS severity9.8
Critical
EPSS probability2.45%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Command injection in COMFAST CF-XR11 firmware 2.7.2 allows remote attackers to execute arbitrary commands through a crafted HTTP POST request. The sub_4143F0 handler in /usr/bin/webmgnt processes the POST-supplied timestr value in a way that permits embedded shell syntax to execute. No authentication or user interaction is required, and successful exploitation grants a shell on the router.

The record

CVE
CVE-2023-38865
Published
Aug 15, 2023
Updated
Oct 9, 2024
Vendor
COMFAST
Product
CF-XR11
Classifications
CWE-77, T1059.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 15, 2023CVE publishedPublication date reported by the CVE source.
  2. Oct 9, 2024Record 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=2.7.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

COMFAST · CF-XR11version=2.7.2

Published CVSS scores

9.8NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-77Improper Neutralization of Special Elements used in a Command ('Command Injection')
T1059.004Unix Shell

Public exploit references

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

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo