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CVE-2021-32918

24
FAUCET Score

CVE-2021-32918 is a remote unauthenticated denial-of-service vulnerability affecting Prosody versions prior to 0.11.9 when running on Lua 5.2 or 5.3, as well as related Debian and Fedora Project distributions. This high-severity vulnerability (CVSS 7.5) allows attackers to exhaust memory resources with low attack complexity and no user interaction required. While no public exploit code or active exploitation has been observed, and community discussion is minimal, organizations using affected Prosody versions should prioritize patching to mitigate potential DoS attacks.

Impacted Technologies

VendorProductVersion(s)CPE
< 0.11.9CPE matchmatch criteria
cpe:2.3:a:prosody:prosody:*:*:*:*:*:*:*:*
10.0CPE matchmatch criteria
cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
32CPE matchmatch criteria
cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:*
33CPE matchmatch criteria
cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*
34CPE matchmatch criteria
cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
2.11%
Probability of exploitation in next 30 days
EPSS Percentile
79.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0211 is in the 64th percentile among its peer group of 51,551 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

blog.prosody.im / prosody-0.11.9-released
Release NotesVendor Advisory
lists.fedoraproject.org / archives/list/package-announce%40lists.fedoraproject.org/message/6MFFBZWXKPZEVZNQSVJNCUE7WRF3T7DG
lists.fedoraproject.org / archives/list/package-announce%40lists.fedoraproject.org/message/GUN63AHEWB2WRROJHU3BVJRWLONCT2B7
lists.fedoraproject.org / archives/list/package-announce%40lists.fedoraproject.org/message/LWJ2DG2DFJOEFEWOUN26IMYYWGSA2ZEE
security.gentoo.org / glsa/202105-15
Third Party Advisory
debian.org / security/2021/dsa-4916
Third Party Advisory
openwall.com / lists/oss-security/2021/05/13/1
Mailing ListThird Party Advisory
openwall.com / lists/oss-security/2021/05/14/2
Mailing ListMitigationThird Party Advisory