Information disclosure via undefined mtvec state
Published Aug 13, 2021 · Updated Aug 3, 2024
CVE-2021-1104 in the RISC-V Instruction Set Manual allows attackers to disclose data, tamper with data, or interrupt service via MTVEC. The Machine Trap Vector Base Address register has an undefined initial state, creating ambiguous trap handling that can expose information, alter data, or disrupt execution. The public record does not specify the required attacker position, privileges, or configuration, so reachability remains implementation-dependent.
Summary
What happened
CVE-2021-1104 in the RISC-V Instruction Set Manual allows attackers to disclose data, tamper with data, or interrupt service via MTVEC. The Machine Trap Vector Base Address register has an undefined initial state, creating ambiguous trap handling that can expose information, alter data, or disrupt execution. The public record does not specify the required attacker position, privileges, or configuration, so reachability remains implementation-dependent.
The record
- CVE
- CVE-2021-1104
- Published
- Aug 13, 2021
- Updated
- Aug 3, 2024
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-908
- Attack vector
- Unavailable
- Privileges
- Unavailable
Timeline
How it unfolded
- Aug 13, 2021CVE publishedPublication date reported by the CVE source.
- Aug 3, 2024Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
What conditions does exploitation require?
What is affected?
Affected products and versions are unavailable in this record.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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