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Exploited vulnerability · CISA KEV

Is CVE-2023-37580 exploited? Yes: in CISA KEV since 27 Jul 2023

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

Yes. CVE-2023-37580, 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 27 Jul 2023. It affects Synacor Zimbra Collaboration Suite (ZCS). If you run it, CISA's required action is: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

exploitedYesCISA KEV · 27 Jul 2023
ransomwareNot knownno confirmed use
EPSStop 5%very likely to be exploited
severity6.1CVSS 3.1 · medium
US federal due17 Aug 2023BOD 22-01 deadline

What it is

Synacor Zimbra Collaboration Suite (ZCS) contains a cross-site scripting vulnerability impacting the confidentiality and integrity of data.

VendorSynacor (19 exploited CVEs in KEV)
ProductZimbra Collaboration Suite (ZCS)
VulnerabilitySynacor Zimbra Collaboration Suite (ZCS) Cross-Site Scripting (XSS) Vulnerability
WeaknessCWE-79
Published31 Jul 2023
Added to KEV27 Jul 2023
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 mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
  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 31 Jul 2023.
  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-2023-37580 being exploited?

Yes. CISA added CVE-2023-37580 to the Known Exploited Vulnerabilities catalog on 27 Jul 2023, which means there is reliable evidence of exploitation in the wild.

Is CVE-2023-37580 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-2023-37580?

Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable. 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 July 2023 · Synacor scorecard · act-now radar.

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