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Exploited vulnerability · CISA KEV

Is CVE-2023-43770 exploited? Yes: in CISA KEV since 12 Feb 2024

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

Yes. CVE-2023-43770, Roundcube Webmail Persistent Cross-Site Scripting (XSS) Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 12 Feb 2024, 143 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 · 12 Feb 2024
ransomwareNot knownno confirmed use
EPSStop 1%among the most likely CVEs to be exploited
severity6.1CVSS 3.1 · medium
US federal due4 Mar 2024BOD 22-01 deadline

What it is

Roundcube Webmail contains a persistent cross-site scripting (XSS) vulnerability that can lead to information disclosure via malicious link references in plain/text messages.

VendorRoundcube (11 exploited CVEs in KEV)
ProductWebmail
VulnerabilityRoundcube Webmail Persistent Cross-Site Scripting (XSS) Vulnerability
WeaknessCWE-79
Published22 Sep 2023
Added to KEV12 Feb 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 22 Sep 2023.
  4. Get told next time. Email alerts when CISA adds a CVE for Roundcube.

Other exploited CVEs in Webmail

References

Questions

Is CVE-2023-43770 being exploited?

Yes. CISA added CVE-2023-43770 to the Known Exploited Vulnerabilities catalog on 12 Feb 2024, which means there is reliable evidence of exploitation in the wild.

Is CVE-2023-43770 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-2023-43770?

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 February 2024 · Roundcube scorecard · act-now radar.

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