CVE-2023-3959 | Zavio IP Camera Stack-Based Buffer Overflow

Zavio CF7500, CF7300, CF7201, CF7501, CB3211, CB3212, CB5220, CB6231, B8520, B8220, and CD321 IP Cameras with firmware version M2.1.6.05 are vulnerable to multiple instances of stack-based overflows. While processing XML elements from incoming network requests, the product does not sufficiently check or validate allocated buffer size. This may lead to remote code execution.

Published: 2023-11-08 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2023-3959 is rated Moderate Risk (61.4/100): CVSS Critical severity, with medium exploitation likelihood (EPSS 0.50%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2023-3959

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2025-11-21 1.08% 0.50% -0.58%
2 2025-11-18 0.50% 1.08% +0.58%
3 2025-09-10 — 0.50% —

Full EPSS history (15 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2023-3959

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
9.8 3.1 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 5.9 [email protected]
9.8 3.1 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 5.9 [email protected]

Weakness enumeration for CVE-2023-3959

Affected software / configurations for CVE-2023-3959

Vendor Product Version Raw CPE
zavio cf7500_firmware m2.1.6.05 cpe:2.3:o:zavio:cf7500_firmware:m2.1.6.05:*:*:*:*:*:*:*
zavio cf7300_firmware m2.1.6.05 cpe:2.3:o:zavio:cf7300_firmware:m2.1.6.05:*:*:*:*:*:*:*
zavio cf7201_firmware m2.1.6.05 cpe:2.3:o:zavio:cf7201_firmware:m2.1.6.05:*:*:*:*:*:*:*
zavio cf7501_firmware m2.1.6.05 cpe:2.3:o:zavio:cf7501_firmware:m2.1.6.05:*:*:*:*:*:*:*
zavio cb3211_firmware m2.1.6.05 cpe:2.3:o:zavio:cb3211_firmware:m2.1.6.05:*:*:*:*:*:*:*
zavio cb3212_firmware m2.1.6.05 cpe:2.3:o:zavio:cb3212_firmware:m2.1.6.05:*:*:*:*:*:*:*
zavio cb5220_firmware m2.1.6.05 cpe:2.3:o:zavio:cb5220_firmware:m2.1.6.05:*:*:*:*:*:*:*
zavio cb6231_firmware m2.1.6.05 cpe:2.3:o:zavio:cb6231_firmware:m2.1.6.05:*:*:*:*:*:*:*
zavio b8520_firmware m2.1.6.05 cpe:2.3:o:zavio:b8520_firmware:m2.1.6.05:*:*:*:*:*:*:*
zavio b8220_firmware m2.1.6.05 cpe:2.3:o:zavio:b8220_firmware:m2.1.6.05:*:*:*:*:*:*:*
zavio cd321_firmware m2.1.6.05 cpe:2.3:o:zavio:cd321_firmware:m2.1.6.05:*:*:*:*:*:*:*

References for CVE-2023-3959

URL Tags
https://www.cisa.gov/news-events/ics-advisories/icsa-23-304-03 Third Party Advisory US Government Resource
cvelogic Threat Intelligence