CVE-2023-5223Network attack vector

Authenticated sandbox escape from judge execution

Published Sep 27, 2023 · Updated Sep 24, 2024

Sandbox escape in HimitZH Hcode Online Judge 4.6-9a65e3f allows remote authenticated users to escape judge isolation. The CNA identifies the Topic Handler as affected but does not disclose the erroneous operation or attacker-controlled input. A low-privileged account is required; public evidence does not establish host compromise or the exact actions available after escape.

CVSS severity6.3
Medium
EPSS probability0.89%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Sandbox escape in HimitZH Hcode Online Judge 4.6-9a65e3f allows remote authenticated users to escape judge isolation. The CNA identifies the Topic Handler as affected but does not disclose the erroneous operation or attacker-controlled input. A low-privileged account is required; public evidence does not establish host compromise or the exact actions available after escape.

The record

CVE
CVE-2023-5223
Published
Sep 27, 2023
Updated
Sep 24, 2024
Vendor
HimitZH
Product
Hcode Online Judge (HOJ)
Classifications
CWE-265, T1611
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 27, 2023CVE publishedPublication date reported by the CVE source.
  2. Sep 24, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=4.6-9a65e3f

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

HimitZH · Hcode Online Judge (HOJ)version=4.6-9a65e3f

Published CVSS scores

6.3VulDBCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
6.5VulDBAV:N/AC:L/Au:S/C:P/I:P/A:P
6.3VulDBCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L

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 exploitUnconfirmed

Weakness, pattern, technique

CWE-265Privilege Issues
T1611Escape to Host

Public exploit references

No public exploit references are available in this record.

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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