TI-2021-00832 Aliases CVE-2021-1104 GHSA-5pxp-m22f-2m9x

Use of uninitialized resource in RISCV.org Machine Trap Base Address Register

MEDIUM 45CWE-908Published 2021-08-13 · Updated 2024-08-03

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: —
Confidentiality · integrity · availability: High · High · High
Fix status: No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA.

Summary

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.

Why it matters now

EPSS 0.01663 76th percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix No fix listed No fixed version in the sources yet

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
RISCV.org	Machine Trap Base Address (MTVEC) Register	All versions	—	No fix listed	CNA

Machine Trap Base Address (MTVEC) Register VendorRISCV.org Affected All versions Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:risc-v:instruction_set_manual::::::::	all versions	Vulnerable	Risc-v

cpe:2.3:a:risc-v:instruction_set_manual:*:*:*:*:*:*:*:* Versions all versions Vulnerable ·Risc-v

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2021-1104
2026-10-03 Alias added: GHSA-5pxp-m22f-2m9x

References

Exploit 1

https://riscv.org/news/2021/08/video-glitching-risc-v-chips-mtvec-corruption-for-hardening-isa-adam-zabrocki-and-alex-matrosov-def-con-29/

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences