CVE-2020-7641
MEDIUMCVE-2020-7641 is a medium-severity (CVSS 4) CWE-1321 vulnerability in grunt-util-property_project grunt-util-property. 1 public exploit reference exists, so weaponization risk is real. O3 Security detects and blocks CVE-2020-7641 exploitation at runtime via eBPF exploit-chain detection and L7 egress monitoring, even on unpatched systems.
This affects all versions of package grunt-util-property. The function call could be tricked into adding or modifying properties of Object.prototype using a __proto__ payload.
Description
This affects all versions of package grunt-util-property. The function call could be tricked into adding or modifying properties of Object.prototype using a proto payload.
Affected Products
grunt-util-propertygrunt-util-property_projectResearch use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.
Detection & mitigation playbook
Vendor / applianceDetect
Inventory every grunt-util-property_project grunt-util-property deployment and check each version against the affected-products list above. Because the exploit targets the running system rather than your application code, also watch for exploitation at the network and runtime layer — O3 flags the exploit behaviour from runtime telemetry and egress traffic even before a vulnerable build is confirmed.
Remediation status
No patch has shipped for CVE-2020-7641 yet — track the grunt-util-property_project grunt-util-property advisory for a fixed release and apply the workarounds below in the meantime.
Mitigate without a patch
Cut exposure now: restrict the management/admin interface to trusted networks, segment the device, and apply the vendor's recommended configuration mitigations and any WAF/IPS signature. O3's runtime protection blocks the exploit chain at execution, holding the line on unpatched or end-of-life systems until you can patch.
How O3 protects you
O3 detects and blocks CVE-2020-7641 exploitation at runtime: eBPF exploit-chain detection, plus L7 egress monitoring that catches the post-exploitation callback and severs the attacker's outbound channel.
Tailored to CVE-2020-7641. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
Frequently Asked Questions
Is CVE-2020-7641 being exploited in your environment?
O3's eBPF runtime sensors and L7 egress monitoring detect and block the CVE-2020-7641 exploit chain at execution — protecting unpatched and end-of-life systems until the vendor patch is applied.