CVE-2023-34552

Adjacent-network code execution via SADP stack overflows

Published Aug 1, 2023 · Updated Jul 9, 2026

Stack-based buffer overflows in EZVIZ C3W and C6N firmware before 5.3.0 allow remote attackers to execute code via SADP multicast packets. The mulicast_parse_sadp_packet and mulicast_get_pack_type functions write crafted SADP packet data beyond stack-buffer bounds. Exploitation requires no authentication but does require access to the same local network, and successful corruption grants code execution on the camera.

CVSS severity8.8
High
EPSS probability0.45%
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 overflows in EZVIZ C3W and C6N firmware before 5.3.0 allow remote attackers to execute code via SADP multicast packets. The mulicast_parse_sadp_packet and mulicast_get_pack_type functions write crafted SADP packet data beyond stack-buffer bounds. Exploitation requires no authentication but does require access to the same local network, and successful corruption grants code execution on the camera.

The record

CVE
CVE-2023-34552
Published
Aug 1, 2023
Updated
Jul 9, 2026
Vendor
Hangzhou EZVIZ Network Co., Ltd.
Product
EZVIZ C3W (ezGuard)
Classifications
CWE-121, CWE-787, T1210
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 1, 2023CVE publishedPublication date reported by the CVE source.
  2. Jul 9, 2026Record 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=0 <5.3.0

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

Hangzhou EZVIZ Network Co., Ltd. · EZVIZ C3W (ezGuard)version=0 <5.3.0
Hangzhou EZVIZ Network Co., Ltd. · EZVIZ C6Nversion=0 <5.3.0

Published CVSS scores

4.0CISA-ADPCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
8.8NVDCVSS:3.1/AV:A/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.

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No observations available

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

Weakness, pattern, technique

CWE-121Stack-based Buffer Overflow
CWE-787Out-of-bounds Write
T1210Exploitation of Remote Services

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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