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Exploited vulnerability · CISA KEV

Is CVE-2020-13965 exploited? Yes: in CISA KEV since 26 Jun 2024

Gociux · Roundcube Webmail · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2020-13965, Roundcube Webmail Cross-Site Scripting (XSS) Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 26 Jun 2024, 1478 days after it was published. It affects Roundcube Webmail. 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 · 26 Jun 2024
ransomwareNot knownno confirmed use
EPSStop 1%among the most likely CVEs to be exploited
severity6.3CVSS 3.1 · medium
US federal due17 Jul 2024BOD 22-01 deadline

What it is

Roundcube Webmail contains a cross-site scripting (XSS) vulnerability that allows a remote attacker to manipulate data via a malicious XML attachment.

VendorRoundcube (11 exploited CVEs in KEV)
ProductWebmail
VulnerabilityRoundcube Webmail Cross-Site Scripting (XSS) Vulnerability
WeaknessCWE-80
Published9 Jun 2020
Added to KEV26 Jun 2024
Reported by (CNA)mitre

What to do

  1. Check whether you run it. Look for Webmail in your asset inventory, including appliances and cloud images. Stack check lists every exploited Roundcube 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 9 Jun 2020.
  4. Get told next time. Email alerts when CISA adds a CVE for Roundcube.

Other exploited CVEs in Webmail

References

Questions

Is CVE-2020-13965 being exploited?

Yes. CISA added CVE-2020-13965 to the Known Exploited Vulnerabilities catalog on 26 Jun 2024, which means there is reliable evidence of exploitation in the wild.

Is CVE-2020-13965 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-2020-13965?

Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable. Check Roundcube's advisory for the fixed versions, and if you can't patch quickly, restrict access to the affected Webmail 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 June 2024 · Roundcube scorecard · act-now radar.

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