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Exploited vulnerability · CISA KEV

Is CVE-2019-9670 exploited? Yes: in CISA KEV since 10 Jan 2022

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

Yes. CVE-2019-9670, Synacor Zimbra Collaboration Suite (ZCS) Improper Restriction of XML External Entity Reference, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 10 Jan 2022, 957 days after it was published. It affects Synacor Zimbra Collaboration Suite (ZCS). If you run it, CISA's required action is: Apply updates per vendor instructions.

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

What it is

Synacor Zimbra Collaboration Suite (ZCS) contains an improper restriction of XML external entity (XXE) vulnerability in the mailboxd component.

VendorSynacor (19 exploited CVEs in KEV)
ProductZimbra Collaboration Suite (ZCS)
VulnerabilitySynacor Zimbra Collaboration Suite (ZCS) Improper Restriction of XML External Entity Reference
WeaknessCWE-611
Published29 May 2019
Added to KEV10 Jan 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 29 May 2019.
  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-2019-9670 being exploited?

Yes. CISA added CVE-2019-9670 to the Known Exploited Vulnerabilities catalog on 10 Jan 2022, which means there is reliable evidence of exploitation in the wild.

Is CVE-2019-9670 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-2019-9670?

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 January 2022 · Synacor scorecard · act-now radar.

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