Security Resilience

CVE-2023-35085

Memory Safety in Ui Unifi Uap Firmware ≤ 6.5.50

Memory Safety
Published
10 August 2023
Modified
21 November 2024
Patch / advisory
View advisory
CVSS Score v3.1 9.8
Click a component to see what it means
Raw vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS Score 0.010 63th percentile
Risk Priority 79 floored blend · peak EPSS

CVSS and EPSS are reproduced from their sources (NVD, FIRST EPSS). Risk Priority is our own derived reading, not an NVD score.

Summary

CVE-2023-35085 is a critical-severity Integer Overflow or Wraparound (CWE-190) vulnerability in Ui Unifi Uap Firmware. Its CVSS base score is 9.8 (Critical).

Operationally, exploitation aligns with the MITRE ATT&CK technique LSA Secrets (T1003.004); ranked in the top 37% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.

Deeper analysis AI-assisted summary

Synthesised by an AI model from the NVD description and linked references — a reading aid, not an authoritative source.

An integer overflow vulnerability, tracked as CVE-2023-35085 and assigned CWE-190, affects UniFi Access Points running version 6.5.50 and earlier as well as UniFi Switches running version 6.5.32 and earlier, excluding the Switch Flex Mini. The flaw is present when SNMP monitoring is enabled under default settings and can result in remote code execution.

Unauthenticated remote attackers can exploit the issue over the network without user interaction to achieve full compromise of affected devices, as reflected in the CVSS 9.8 score indicating high impact to confidentiality, integrity, and availability.

Ubiquiti's security advisory directs administrators to update Access Points to version 6.5.62 or later and Switches to version 6.5.59 or later. The associated EPSS score reached a peak of 0.0704 after disclosure before receding to its current value of 0.0401.

EU & UK References

Vulnerability Data

An integer overflow vulnerability in all UniFi Access Points and Switches, excluding the Switch Flex Mini, with SNMP Monitoring and default settings enabled could allow a Remote Code Execution (RCE). Affected Products: All UniFi Access Points (Version 6.5.50 and earlier)…

more

All UniFi Switches (Version 6.5.32 and earlier) -USW Flex Mini excluded. Mitigation: Update UniFi Access Points to Version 6.5.62 or later. Update the UniFi Switches to Version 6.5.59 or later.

CWE(s)
CWE-190

Related Threats

MITRE ATT&CK Enterprise Techniques

T1003.004 LSA Secrets Credential Access
Adversaries with SYSTEM access to a host may attempt to access Local Security Authority (LSA) secrets, which can contain a variety of different credential materials, such as credentials for service accounts.
attack.mitre.org →
T1003.005 Cached Domain Credentials Credential Access
Adversaries may attempt to access cached domain credentials used to allow authentication to occur in the event a domain controller is unavailable.
attack.mitre.org →
T1003.006 DCSync Credential Access
Adversaries may attempt to access credentials and other sensitive information by abusing a Windows Domain Controller's application programming interface (API)(Citation: Microsoft DRSR Dec 2017) (Citation: Microsoft GetNCCChanges) (Citati…
attack.mitre.org →
T1003.008 /etc/passwd and /etc/shadow Credential Access
Adversaries may attempt to dump the contents of <code>/etc/passwd</code> and <code>/etc/shadow</code> to enable offline password cracking.
attack.mitre.org →
T1006 Direct Volume Access Stealth
Adversaries may directly access a volume to bypass file access controls and file system monitoring.
attack.mitre.org →
T1008 Fallback Channels Command And Control
Adversaries may use fallback or alternate communication channels if the primary channel is compromised or inaccessible in order to maintain reliable command and control and to avoid data transfer thresholds.
attack.mitre.org →
Derived from this CVE’s CWE(s) via the direct CWE→ATT&CK cross-walk.

CVEs Like This One

CVE-2023-38034Same product: Ui U6-Enterprise
CVE-2026-21639Same vendor: Ui
CVE-2023-31998Same vendor: Ui
CVE-2023-5869Shared CWE-190
CVE-2026-46384Shared CWE-190
CVE-2026-20884Shared CWE-190
CVE-2026-34640Shared CWE-190
CVE-2026-43818Shared CWE-190
CVE-2023-28237Shared CWE-190
CVE-2026-42144Shared CWE-190

Affected Assets

ui
unifi uap firmware
≤ 6.5.50
ui
unifi switch firmware
≤ 6.5.32

Mitigating Controls

Control response

Prevent
Stop it (NIST 800-53)

—

Detect
Catch it (NIST detect / respond)

—

Harden
Shrink the surface (DISA STIG)

—

Validate
Prove the fix (OWASP ASVS)
  • V5.2.6

Mitigating Controls (NIST CSF 2.0) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.

PR.PS-06 partial match
blocks

Secure SDLC practices directly require use of safe arithmetic, bounds checks, and testing that prevent integer overflows.

Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.

A.5.14 Information transfer partial match
removes
A.5.15 Access control partial match
removes
A.5.16 Identity management partial match
removes
A.5.17 Authentication information partial match
removes
A.5.18 Access rights partial match
removes
A.8.10 Information deletion partial match
removes

References