How severe is CVE-2007-5633?

CVE-2007-5633 has a CVSS 2.0 base score of 7.2, rated high severity.

Is CVE-2007-5633 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (56th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2007-5633?

CVE-2007-5633 affects Almico Speedfan. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2007-5633?

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

When was CVE-2007-5633 published?

CVE-2007-5633 was published on 2007-10-23 and last updated on 2026-06-16.

CVE-2007-5633

CVE-2007-5633 is a high-severity vulnerability in Almico Speedfan with a CVSS 2.0 base score of 7.2. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: High (CVSS 2.0 base score 7.2)
EPSS exploit prediction: 1% (56th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Almico Speedfan
Published: 2007-10-23
Last modified: 2026-06-16

Description

Speedfan.sys in Alfredo Milani Comparetti SpeedFan 4.33, when used on Microsoft Windows Vista x64, allows local users to read or write arbitrary MSRs, and gain privileges and load unsigned drivers, via the (1) IOCTL_RDMSR 0x9C402438 and (2) IOCTL_WRMSR 0x9C40243C IOCTLs to \Device\speedfan, as demonstrated by an IOCTL_WRMSR action on MSR_LSTAR.

Frequently asked questions

What is CVE-2007-5633?: Speedfan.sys in Alfredo Milani Comparetti SpeedFan 4.33, when used on Microsoft Windows Vista x64, allows local users to read or write arbitrary MSRs, and gain privileges and load unsigned drivers, via the (1) IOCTL_RDMSR 0x9C402438 and (2) IOCTL_WRMSR 0x9C40243C IOCTLs to \Device\speedfan, as demonstrated by an IOCTL_WRMSR action on MSR_LSTAR.
How severe is CVE-2007-5633?: CVE-2007-5633 has a CVSS 2.0 base score of 7.2, rated high severity.
Is CVE-2007-5633 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (56th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2007-5633?: CVE-2007-5633 affects Almico Speedfan. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2007-5633?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2007-5633 published?: CVE-2007-5633 was published on 2007-10-23 and last updated on 2026-06-16.

References

Affected products (1)

cpe:2.3:a:almico:speedfan:4.33:*:*:*:*:*:*:*

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CVE-2020-28175 — High (CVSS 7.8): There is a local privilege escalation vulnerability in Alfredo Milani Comparetti SpeedFan 4.52. Attackers can use…
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