CVE-2021-45701 — Tremor-Script
CRITICALCVE-2021-45701 is a critical-severity (CVSS 9.8) Use After Free vulnerability in linuxfoundation tremor-script. A fix is available — see the affected versions and patch details below.
An issue was discovered in the tremor-script crate before 0.11.6 for Rust. A patch operation may result in a use-after-free.
EPSS Exploitation Probability
Probability of exploitation in the next 30 days, from FIRST.org EPSS.
How urgent is this, really
CVE-2021-45701 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.
Where this sits among everything scored
Of 382,795 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.
Description
An issue was discovered in the tremor-script crate before 0.11.6 for Rust. A patch operation may result in a use-after-free.
Affected Products
tremor-scriptlinuxfoundationDetection & mitigation playbook
Vendor / applianceDetect
Inventory every linuxfoundation tremor-script deployment and check each version against the affected-products list above.
Fix
Apply the linuxfoundation tremor-script security patch or hotfix for CVE-2021-45701 on the affected version, following the vendor advisory for your exact build.
Workarounds
Constrain what reaches the vulnerable code: limit the size and shape of untrusted input, isolate the affected component in a sandboxed or least-privileged process, and enable the platform's memory-safety mitigations (ASLR, stack protector, hardened allocator) so an out-of-bounds access is more likely to fail closed than to be exploitable. Alongside that, restrict the management interface to trusted networks and apply the vendor's recommended configuration mitigations.
Frequently Asked Questions
Is CVE-2021-45701 being exploited in your environment?
Detect and block the exploit chain at execution, on systems you cannot patch yet.