Is CVE-2021-32918 being actively exploited?

It is not currently in CISA's KEV catalog. Its EPSS exploitation probability is 2%.

What products does CVE-2021-32918 affect?

Tracked products affected include Lua. Check the version you run to see whether it is affected.

How do I fix CVE-2021-32918?

Apply the vendor fix promptly. Upgrade affected products to a fixed version.

CVE-2021-32918

Q: What is CVE-2021-32918?

CVE-2021-32918 is a high-severity software vulnerability (Uncontrolled resource consumption) with a CVSS score of 7.5. An issue was discovered in Prosody before 0.11.9. Default settings are susceptible to remote unauthenticated denial-of-service (DoS) attacks via memory exhaustion when running under Lua 5.2 or Lua 5.3.

HIGH severity · CVSS 7.5 · Uncontrolled resource consumption

7.5CVSS HIGH

Summary

An issue was discovered in Prosody before 0.11.9. Default settings are susceptible to remote unauthenticated denial-of-service (DoS) attacks via memory exhaustion when running under Lua 5.2 or Lua 5.3.

Impact & exploitability

Attack vectorNetwork

Attack complexityLow

Privileges requiredNone

User interactionNone

Confidentiality impactNone

Integrity impactNone

Availability impactHigh

Exploit probability (EPSS)2%

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products we track (1)

Lua

Recommendation

Apply the vendor fix promptly. Open any affected product above for its exact safe version.

Additional information

NVD record
https://blog.prosody.im/prosody-0.11.9-released/Advisory
http://www.openwall.com/lists/oss-security/2021/05/14/2Advisory
http://www.openwall.com/lists/oss-security/2021/05/13/1Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6MFFBZWXKPZEVZNQSVJNCUE7WRF3T7DG/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GUN63AHEWB2WRROJHU3BVJRWLONCT2B7/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LWJ2DG2DFJOEFEWOUN26IMYYWGSA2ZEE/
https://security.gentoo.org/glsa/202105-15Advisory
https://www.debian.org/security/2021/dsa-4916Advisory