CVE-2025-63094: XiangShan Nanhu V2 and XiangShan Kunmighu V3 were discovered to use speculative execution and indirect branch

This week

HIGH 7.5REMOTEDOWNGRADE

CVE-2025-63094 is a high-severity flaw (CVSS 7.5) affecting xiangshan. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

XiangShan Nanhu V2 and XiangShan Kunmighu V3 were discovered to use speculative execution and indirect branch prediction, allowing attackers to access sensitive information via side-channel analysis of the data cache.

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.6% (top 52%)
CISA exploited list	No
Weakness	CWE-200, CWE-203
Published	2025-12-10
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: xiangshan

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-12-10 18:16 UTCPublished CVE record published
2026-06-17 09:52 UTCUpdated Record last modified

xiangshan xiangshan DOWNGRADE

Affected: 2.0 · 3.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.0

1. Check installed version

apt-cache policy xiangshan || rpm -q xiangshan || xiangshan --version

2. No fixed release: DOWNGRADE to a release before 2.0 (Debian / Ubuntu)

apt-cache madison xiangshan sudo apt install xiangshan=<VERSION_BEFORE_2.0> sudo apt-mark hold xiangshan

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list xiangshan sudo dnf downgrade xiangshan-<VERSION_BEFORE_2.0> sudo dnf versionlock add xiangshan

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-63094?

xiangshan: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2025-63094 being exploited?

CVE-2025-63094 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-63094 affect?

CVE-2025-63094 affects xiangshan. Severity is high (CVSS 7.5). XiangShan Nanhu V2 and XiangShan Kunmighu V3 were discovered to use speculative execution and indirect branch prediction, allowing attackers to access sensitive information via side-channel analysis of the data cache.

How urgent is CVE-2025-63094?

Priority 48/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

References

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