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Exploited vulnerability · CISA KEV

Is CVE-2018-6882 exploited? Yes: in CISA KEV since 19 Apr 2022

Gociux · Synacor Zimbra Collaboration Suite (ZCS) · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2018-6882, Synacor Zimbra Collaboration Suite (ZCS) Cross-Site Scripting (XSS) Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 19 Apr 2022, 1484 days after it was published. It is known to be used in ransomware campaigns. It affects Synacor Zimbra Collaboration Suite (ZCS). If you run it, CISA's required action is: Apply updates per vendor instructions.

exploitedYesCISA KEV · 19 Apr 2022
ransomwareKnownused in campaigns
EPSStop 5%very likely to be exploited
severity6.1CVSS 3.1 · medium
US federal due10 May 2022BOD 22-01 deadline

What it is

Synacor Zimbra Collaboration Suite (ZCS) contains a cross-site scripting vulnerability that might allow remote attackers to inject arbitrary web script or HTML.

VendorSynacor (19 exploited CVEs in KEV)
ProductZimbra Collaboration Suite (ZCS)
VulnerabilitySynacor Zimbra Collaboration Suite (ZCS) Cross-Site Scripting (XSS) Vulnerability
WeaknessCWE-79
Published27 Mar 2018
Added to KEV19 Apr 2022
Reported by (CNA)mitre

What to do

  1. Check whether you run it. Look for Zimbra Collaboration Suite (ZCS) in your asset inventory, including appliances and cloud images. Stack check lists every exploited Synacor 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 27 Mar 2018.
  4. Get told next time. Email alerts when CISA adds a CVE for Synacor.

Other exploited CVEs in Zimbra Collaboration Suite (ZCS)

References

Questions

Is CVE-2018-6882 being exploited?

Yes. CISA added CVE-2018-6882 to the Known Exploited Vulnerabilities catalog on 19 Apr 2022, which means there is reliable evidence of exploitation in the wild.

Is CVE-2018-6882 used in ransomware attacks?

Yes, CISA lists it as known to be used in ransomware campaigns.

How do I fix CVE-2018-6882?

Apply updates per vendor instructions. Check Synacor's advisory for the fixed versions, and if you can't patch quickly, restrict access to the affected Zimbra Collaboration Suite (ZCS) 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 April 2022 · Synacor scorecard · act-now radar.

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