CVE-2025-56513: NiceHash QuickMiner 6.12.0 perform software updates over HTTP without validating digital signatures or hash ch

This week

CRITICAL 9.8REMOTEDOWNGRADE

CVE-2025-56513 is a critical-severity flaw (CVSS 9.8) affecting quickminer. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

NiceHash QuickMiner 6.12.0 perform software updates over HTTP without validating digital signatures or hash checks. An attacker capable of intercepting or redirecting traffic to the update url and can hijack the update process and deliver arbitrary executables that are automatically executed, resulting in full remote code execution. This constitutes a critical supply chain attack vector. NOTE: the Supplier reports that the existence of an http://

Why this priority

Critical 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	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.4% (top 61%)
CISA exploited list	No
Weakness	CWE-494
Published	2025-09-30
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: nicehash

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

Am I affected?

Timeline

2025-09-30 18:15 UTCPublished CVE record published
2026-06-17 09:42 UTCUpdated Record last modified

nicehash quickminer DOWNGRADE

Affected: 6.12.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 6.12.0

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 6.12.0 (Debian / Ubuntu)

apt-cache madison quickminer sudo apt install quickminer=<VERSION_BEFORE_6.12.0> sudo apt-mark hold quickminer

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

dnf --showduplicates list quickminer sudo dnf downgrade quickminer-<VERSION_BEFORE_6.12.0> sudo dnf versionlock add quickminer

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-2025-56513?

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

Is CVE-2025-56513 being exploited?

CVE-2025-56513 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-2025-56513 affect?

CVE-2025-56513 affects quickminer. Severity is critical (CVSS 9.8). NiceHash QuickMiner 6.12.0 perform software updates over HTTP without validating digital signatures or hash checks. An attacker capable of intercepting or redirecting traffic to the update url and can hijack the update process and deliver a

How urgent is CVE-2025-56513?

Priority 54/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

References

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