CVE-2021-1104
CVSS v3
9.8
CRITICAL
EPSS Score
1.7 %
exploit probability, as of 2026-09-25
CISA KEV
No
known exploited
Exploitation
—
SSVC status
Description
The RISC-V Instruction Set Manual contains a documented ambiguity for the Machine Trap Vector Base Address (MTVEC) register that may lead to a vulnerability due to the initial state of the register not being defined, potentially leading to information disclosure, data tampering and denial of service.
Technical details
- Published
- 2021-08-13
Frequently asked questions
What is CVE-2021-1104?
The RISC-V Instruction Set Manual contains a documented ambiguity for the Machine Trap Vector Base Address (MTVEC) register that may lead to a vulnerability due to the initial state of the register not being defined, potentially leading to information disclosure, data tampering and denial of service.
Is CVE-2021-1104 actively exploited?
Active exploitation of CVE-2021-1104 has not been confirmed. Its EPSS score was 1.7% on 2026-09-25, the estimated probability of exploitation in the next 30 days.
What is the CVSS score for CVE-2021-1104?
CVE-2021-1104 has a CVSS v3 base score of 9.8 (CRITICAL severity).
Is CVE-2021-1104 affecting your environment?
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