CVE-2023-50559: An issue was discovered in XiangShan v2.1, allows local attackers to obtain sensitive information via the L1D

Routine

MEDIUM 5.5DOWNGRADE

CVE-2023-50559 is a medium-severity flaw (CVSS 5.5) affecting xiangshan. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An issue was discovered in XiangShan v2.1, allows local attackers to obtain sensitive information via the L1D cache.

Why this priority

No elevated risk signals yet

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

Risk facts

CVSS score	5.5 (Medium)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.2% (top 91%)
CISA exploited list	No
Published	2023-12-30
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: openxiangshan

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

Am I affected?

Timeline

2023-12-30 00:15 UTCPublished CVE record published
2026-06-17 06:39 UTCUpdated Record last modified

openxiangshan xiangshan DOWNGRADE

Affected: 2.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.1

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 2.1 (Debian / Ubuntu)

apt-cache madison xiangshan sudo apt install xiangshan=<VERSION_BEFORE_2.1> sudo apt-mark hold xiangshan

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

dnf --showduplicates list xiangshan sudo dnf downgrade xiangshan-<VERSION_BEFORE_2.1> 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-2023-50559?

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

Is CVE-2023-50559 being exploited?

CVE-2023-50559 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-2023-50559 affect?

CVE-2023-50559 affects xiangshan. Severity is medium (CVSS 5.5). An issue was discovered in XiangShan v2.1, allows local attackers to obtain sensitive information via the L1D cache.

How urgent is CVE-2023-50559?

Priority 21/100. No elevated risk signals yet.

Related CVEs

CVE-2025-63094 HIGH 7.5 DOWNGRADE XiangShan Nanhu V2 and XiangShan Kunmighu V3 were discovered to use speculative execution and indirect branch

References

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