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Exploited vulnerability · CISA KEV

Is CVE-2015-1635 exploited? Yes: in CISA KEV since 10 Feb 2022

Gociux · Microsoft HTTP.sys · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2015-1635, Microsoft HTTP.sys Remote Code Execution Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 10 Feb 2022, 2494 days after it was published. It affects Microsoft HTTP.sys. If you run it, CISA's required action is: Apply updates per vendor instructions.

exploitedYesCISA KEV · 10 Feb 2022
ransomwareNot knownno confirmed use
EPSStop 1%among the most likely CVEs to be exploited
severity9.8CVSS 3.1 · critical
US federal due10 Aug 2022BOD 22-01 deadline

What it is

Microsoft HTTP protocol stack (HTTP.sys) contains a vulnerability that allows for remote code execution.

VendorMicrosoft (391 exploited CVEs in KEV)
ProductHTTP.sys
VulnerabilityMicrosoft HTTP.sys Remote Code Execution Vulnerability
WeaknessCWE-94
Published14 Apr 2015
Added to KEV10 Feb 2022
Reported by (CNA)microsoft

What to do

  1. Check whether you run it. Look for HTTP.sys in your asset inventory, including appliances and cloud images. Stack check lists every exploited Microsoft CVE at once.
  2. Apply the fix. Apply updates per vendor instructions.
  3. If you can't patch today, take the affected service off the internet or restrict who can reach it, and check its logs for signs of compromise since 14 Apr 2015.
  4. Get told next time. Email alerts when CISA adds a CVE for Microsoft.

References

Questions

Is CVE-2015-1635 being exploited?

Yes. CISA added CVE-2015-1635 to the Known Exploited Vulnerabilities catalog on 10 Feb 2022, which means there is reliable evidence of exploitation in the wild.

Is CVE-2015-1635 used in ransomware attacks?

CISA does not list known ransomware use for it. That can change, and exploitation alone is reason to fix it first.

How do I fix CVE-2015-1635?

Apply updates per vendor instructions. Check Microsoft's advisory for the fixed versions, and if you can't patch quickly, restrict access to the affected HTTP.sys and watch it for signs of compromise.

Sources: CISA KEV (exploitation, ransomware use, required action, due date), the CVE record (publication date, CVSS, CNA), NVD and FIRST EPSS (live score). More: all KEV additions in February 2022 · Microsoft scorecard · act-now radar.

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