How severe is CVE-2025-51677?

CVE-2025-51677 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability high.

Is CVE-2025-51677 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (36th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2025-51677?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2025-51677 published?

CVE-2025-51677 was published on 2026-07-17 and last updated on 2026-07-23.

CVE-2025-51677

CVE-2025-51677 is a critical-severity vulnerability with a CVSS 3.x base score of 9.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-116.

Key facts

Severity: Critical (CVSS 3.x base score 9.1)
EPSS exploit prediction: 0% (36th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-116
Published: 2026-07-17
Last modified: 2026-07-23

Description

An issue was discovered in openRISC OR1200 commit 83ac6b. An output mismatch between the RTL and the netlist of the or1200 cpu output port can lead to unexpected behavior.

Frequently asked questions

What is CVE-2025-51677?: An issue was discovered in openRISC OR1200 commit 83ac6b. An output mismatch between the RTL and the netlist of the or1200 cpu output port can lead to unexpected behavior.
How severe is CVE-2025-51677?: CVE-2025-51677 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability high.
Is CVE-2025-51677 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (36th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2025-51677?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2025-51677 published?: CVE-2025-51677 was published on 2026-07-17 and last updated on 2026-07-23.

References

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