An issue was discovered in the ALU unit of the OR1200 (aka OpenRISC 1200) processor…
Priority MEDIUM 50CWE-287Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-287.
Summary
An issue was discovered in the ALU unit of the OR1200 (aka OpenRISC 1200) processor 2011-09-10 through 2015-11-11. The overflow flag is not being updated correctly for the subtract instruction, which results in an incorrect value in the overflow flag. Any software that relies on this flag may experience corruption in execution.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00728 54th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2021-40507
- 2026-10-03 Alias added: GHSA-fw2g-jg6j-943h
References
More Openrisc Or1200 Firmware vulnerabilities
- TI-2021-17552 An issue was discovered in the ALU unit of the OR1200 (aka OpenRISC 1200) processor… CVSS 3.1CRITICAL 9.8
Sources
- CVE-2021-40507 · CVE Program
- CVE-2021-40507 · NVD
- FIRST EPSS
- GHSA-fw2g-jg6j-943h · GitHub Advisory Database · CC BY 4.0
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