CVE-2022-35222

Arbitrary code execution via unchecked parameter length

Published Aug 2, 2022 · Updated Sep 16, 2024

Stack-based buffer overflow in Chunghwa Telecom HiCOS client builds allows physically proximate attackers to execute arbitrary code. While reading smart-card information, the client component processes a parameter without first validating its length, overflowing a stack buffer. Physical access and no prior privileges are required; successful exploitation permits arbitrary code or system-command execution, or a service interruption.

CVSS severity6.8
Medium
EPSS probability0.38%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack-based buffer overflow in Chunghwa Telecom HiCOS client builds allows physically proximate attackers to execute arbitrary code. While reading smart-card information, the client component processes a parameter without first validating its length, overflowing a stack buffer. Physical access and no prior privileges are required; successful exploitation permits arbitrary code or system-command execution, or a service interruption.

The record

CVE
CVE-2022-35222
Published
Aug 2, 2022
Updated
Sep 16, 2024
Vendor
Chunghwa Telecom
Product
HiCOS Natural Person Credential Component Client
Classifications
CWE-787, T1203
Attack vector
physical
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 2, 2022CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 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=HiCOSPKCS11.dll CHT PKCS#11 3.1.0.00002
  2. Affected versionversion=libHicos_p11v1.dylib CHT PKCS#11 3.0.3.30404
  3. Affected versionversion=libHicos_p11v1.so CHT PKCS#11 3.0.3.30306

What conditions does exploitation require?

Attack vectorphysical
Required privilegesunauthenticated

What is affected?

Chunghwa Telecom · HiCOS Natural Person Credential Component Clientversion=HiCOSPKCS11.dll CHT PKCS#11 3.1.0.00002; version=libHicos_p11v1.dylib CHT PKCS#11 3.0.3.30404; version=libHicos_p11v1.so CHT PKCS#11 3.0.3.30306

Published CVSS scores

6.8TWCERT/CCCVSS:3.1/AV:P/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)
Vectorphysical
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write
T1203Exploitation for Client Execution

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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