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CVE-2023-3959

Zavio B8220 Firmware remote code execution

9.8 CRITICALEPSS 48.8%
  1. Published8 Nov 2023

Description

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Zavio B8220 Firmwarem2.1.6.05
Zavio B8520 Firmwarem2.1.6.05
Zavio Cb3211 Firmwarem2.1.6.05
Zavio Cb3212 Firmwarem2.1.6.05
Zavio Cb5220 Firmwarem2.1.6.05
Zavio Cb6231 Firmwarem2.1.6.05
Zavio Cd321 Firmwarem2.1.6.05
Zavio Cf7201 Firmwarem2.1.6.05
Zavio Cf7300 Firmwarem2.1.6.05
Zavio Cf7500 Firmwarem2.1.6.05
Zavio Cf7501 Firmwarem2.1.6.05

Remediation

No fixed version is recorded in the NVD data. Check the vendor advisory for the latest guidance.

Frequently asked

Is CVE-2023-3959 being actively exploited?

CVE-2023-3959 is not in the CISA KEV catalog. Its EPSS exploit probability is 48.8%.

How severe is CVE-2023-3959?

CVE-2023-3959 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 48.8% probability of exploitation.

Which products are affected by CVE-2023-3959?

Affected products include Zavio B8220 Firmware, Zavio B8520 Firmware, Zavio Cb3211 Firmware, Zavio Cb3212 Firmware, Zavio Cb5220 Firmware, and 6 more.

How do I fix CVE-2023-3959?

Apply the vendor's patch or advisory guidance, then verify no affected versions remain across your devices.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2023-3959 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.