CVE-2021-44527
CVE-2021-44527 is a medium-severity vulnerability in Ui Unifi Switch Firmware with a CVSS 3.x base score of 6.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-400.
Key facts
- Severity: Medium (CVSS 3.x base score 6.5)
- CVSS v2: 6.1
- EPSS exploit prediction: 0% (29th percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-400
- Affected product: Ui Unifi Switch Firmware
- Published:
- Last modified:
Description
A vulnerability found in UniFi Switch firmware Version 5.43.35 and earlier allows a malicious actor who has already gained access to the network to perform a Deny of Service (DoS) attack on the affected switch.This vulnerability is fixed in UniFi Switch firmware 5.76.6 and later.
Frequently asked questions
- What is CVE-2021-44527?
- A vulnerability found in UniFi Switch firmware Version 5.43.35 and earlier allows a malicious actor who has already gained access to the network to perform a Deny of Service (DoS) attack on the affected switch.This vulnerability is fixed in UniFi Switch firmware 5.76.6 and later.
- How severe is CVE-2021-44527?
- CVE-2021-44527 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over an adjacent network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
- Is CVE-2021-44527 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (29th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2021-44527?
- CVE-2021-44527 affects Ui Unifi Switch Firmware. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2021-44527?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- When was CVE-2021-44527 published?
- CVE-2021-44527 was published on 2021-12-07 and last updated on 2026-06-17.
References
Affected products (1)
- cpe:2.3:o:ui:unifi_switch_firmware:*:*:*:*:*:*:*:*
More vulnerabilities in Ui Unifi Switch Firmware
- CVE-2023-38034 — Critical (CVSS 9.8): A command injection vulnerability in the DHCP Client function of all UniFi Access Points and Switches, excluding the…
- CVE-2023-35085 — Critical (CVSS 9.8): An integer overflow vulnerability in all UniFi Access Points and Switches, excluding the Switch Flex Mini, with SNMP…
All CVEs affecting Ui Unifi Switch Firmware →
Other CWE-400 (Uncontrolled Resource Consumption) vulnerabilities
- CVE-2026-46775 — Critical (CVSS 9.9): Vulnerability in Oracle REST Data Services (component: Core). Supported versions that are affected are 24.2.0-26.1.0.…
- CVE-2025-61303 — Critical (CVSS 9.8): Hatching Triage Sandbox Windows 10 build 2004 (2025-08-14) and Windows 10 LTSC 2021(2025-08-14) contains a…
- CVE-2025-43193 — Critical (CVSS 9.8): The issue was addressed with improved memory handling. This issue is fixed in macOS Sequoia 15.6, macOS Sonoma 14.7.7,…
- CVE-2025-24269 — Critical (CVSS 9.8): The issue was addressed with improved memory handling. This issue is fixed in macOS Sequoia 15.4. An app may be able to…
- CVE-2025-24264 — Critical (CVSS 9.8): The issue was addressed with improved memory handling. This issue is fixed in Safari 18.4, iOS 18.4 and iPadOS 18.4,…
- CVE-2025-24260 — Critical (CVSS 9.8): The issue was addressed with improved memory handling. This issue is fixed in macOS Sequoia 15.4, macOS Sonoma 14.7.5,…
Browse all CWE-400 (Uncontrolled Resource Consumption) vulnerabilities →