CVE-2026-41429

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{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,3.3.8)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "arduino-esp32", "source": "cna", "vendor": "espressif"}, "product": "arduino-esp32", "vendor": "espressif"}], "analysis": {"en": {"generated_at": "2026-04-28T05:49:51.845582+00:00", "value": {"mitigation_remediation": ["Upgrade the Arduino ESP32 core to version 3.3.8 or later", "If NetBIOS is not required, disable NBNS by removing the NBNS.begin(...) call from the code", "Configure network or firewall rules to block or restrict UDP traffic on port 137 to limit local\u2011network reachability"], "summary": {"action": "Apply Patch", "impact": "Remote Memory Corruption"}, "threat_synthesis": {"affected_systems": "The affected product is espressif:arduino-esp32, the Arduino core for ESP32, ESP32\u2011S2, ESP32\u2011S3, ESP32\u2011C3, ESP32\u2011C6 and ESP32\u2011H2 microcontrollers. All releases prior to 3.3.8 are vulnerable; the flaw is fixed in version 3.3.8 and later.", "description_and_impact": "Prior to version 3.3.8 the Arduino core for ESP32 devices parses NetBIOS Name Service (NBNS) packets without validating the name_len field and copies the resulting payload into a fixed\u2011size buffer. This flaw allows an attacker on the same local network to send a crafted UDP packet to port 137 and trigger a memory corruption that can lead to arbitrary code execution or system crash. The vulnerability is listed under CWE\u2011121, a stack buffer overflow. The high CVSS score of 8.8 reflects the potential for severe impact on confidentiality, integrity, and availability when the flaw is exploited.", "risk_and_exploitability": "CVSS 8.8 places this issue in the high severity range, and the EPSS score of less than 1% indicates a low but non\u2011zero likelihood of exploitation in the wild. The vulnerability is not listed in the CISA KEV catalog, yet it can be exploited by an adversary who can send packets to the affected device from the local network. The actor needs only local network access; network segmentation or firewall rules that block UDP port 137 reduce the attack surface. Because the flaw leads to memory corruption, an exploit could achieve arbitrary code execution or denial of service depending on the device configuration."}}}}, "created": "2026-04-27T20:15:12.104697+00:00", "updated": "2026-04-28T06:00:09.586800+00:00", "vendors": ["espressif", "espressif$PRODUCT$arduino-esp32"]}