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Exploited vulnerability · CISA KEV

Is CVE-2020-17496 exploited? Yes: in CISA KEV since 3 Nov 2021

Gociux · vBulletin · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2020-17496, vBulletin PHP Module Remote Code Execution Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 3 Nov 2021, 448 days after it was published. It affects vBulletin. If you run it, CISA's required action is: Apply updates per vendor instructions.

exploitedYesCISA KEV · 3 Nov 2021
ransomwareNot knownno confirmed use
EPSStop 1%among the most likely CVEs to be exploited
severity9.8CVSS 3.1 · critical
US federal due3 May 2022BOD 22-01 deadline

What it is

The PHP module within vBulletin contains an unspecified vulnerability that allows for remote code execution via crafted subWidgets data in an ajax/render/widget_tabbedcontainer_tab_panel request. This CVE ID resolves an incomplete patch for CVE-2019-16759.

VendorvBulletin (2 exploited CVEs in KEV)
ProductvBulletin
VulnerabilityvBulletin PHP Module Remote Code Execution Vulnerability
WeaknessCWE-74
Published12 Aug 2020
Added to KEV3 Nov 2021
Reported by (CNA)mitre

What to do

  1. Check whether you run it. Look for vBulletin in your asset inventory, including appliances and cloud images. Stack check lists every exploited vBulletin 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 12 Aug 2020.
  4. Get told next time. Email alerts when CISA adds a CVE for vBulletin.

Other exploited CVEs in vBulletin

References

Questions

Is CVE-2020-17496 being exploited?

Yes. CISA added CVE-2020-17496 to the Known Exploited Vulnerabilities catalog on 3 Nov 2021, which means there is reliable evidence of exploitation in the wild.

Is CVE-2020-17496 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-2020-17496?

Apply updates per vendor instructions. Check vBulletin's advisory for the fixed versions, and if you can't patch quickly, restrict access to the affected vBulletin 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 November 2021 · vBulletin scorecard · act-now radar.

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