CVE-2023-28488Public exploit

Network-adjacent service termination via DHCP length underflow

Published Apr 12, 2023 · Updated Feb 8, 2025

Stack-based buffer overflow in ConnMan 1.41 and earlier allows network-adjacent attackers to terminate connman via crafted DHCP replies. In gdhcp/client.c, dhcp_recv_l2_packet replaces the actual read length with the IP total-length field, then subtracts header sizes for memcpy, allowing an undersized value to underflow into a huge copy length. The attacker must supply DHCP Offer or ACK traffic while the client uses layer-2 listening; successful triggering corrupts the stack and terminates only the ConnMan process.

CVSS severity6.5
Medium
EPSS probability0.96%
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 ConnMan 1.41 and earlier allows network-adjacent attackers to terminate connman via crafted DHCP replies. In gdhcp/client.c, dhcp_recv_l2_packet replaces the actual read length with the IP total-length field, then subtracts header sizes for memcpy, allowing an undersized value to underflow into a huge copy length. The attacker must supply DHCP Offer or ACK traffic while the client uses layer-2 listening; successful triggering corrupts the stack and terminates only the ConnMan process.

The record

CVE
CVE-2023-28488
Published
Apr 12, 2023
Updated
Feb 8, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-787, T1499.004
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 12, 2023CVE publishedPublication date reported by the CVE source.
  2. Feb 8, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.5NIST National Vulnerability DatabaseCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
6.5CISA-ADPCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/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.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-787Out-of-bounds Write
T1499.004Application 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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