How severe is CVE-2021-32917?

CVE-2021-32917 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.

Is CVE-2021-32917 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (80th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-32917?

CVE-2021-32917 primarily affects Prosody. In total, 6 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-32917?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-32917 published?

CVE-2021-32917 was published on 2021-05-13 and last updated on 2026-06-17.

CVE-2021-32917

CVE-2021-32917 is a medium-severity vulnerability in Prosody with a CVSS 3.x base score of 5.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-862.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
CVSS v2: 4.3
EPSS exploit prediction: 2% (80th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-862
Affected product: Prosody
Published: 2021-05-13
Last modified: 2026-06-17

Description

An issue was discovered in Prosody before 0.11.9. The proxy65 component allows open access by default, even if neither of the users has an XMPP account on the local server, allowing unrestricted use of the server's bandwidth.

Frequently asked questions

What is CVE-2021-32917?: An issue was discovered in Prosody before 0.11.9. The proxy65 component allows open access by default, even if neither of the users has an XMPP account on the local server, allowing unrestricted use of the server's bandwidth.
How severe is CVE-2021-32917?: CVE-2021-32917 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.
Is CVE-2021-32917 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (80th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-32917?: CVE-2021-32917 primarily affects Prosody. In total, 6 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-32917?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-32917 published?: CVE-2021-32917 was published on 2021-05-13 and last updated on 2026-06-17.

References

Affected products (6)

cpe:2.3:a:prosody:prosody:*:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*

More vulnerabilities in Prosody

CVE-2014-2745 — High (CVSS 7.8): Prosody before 0.9.4 does not properly restrict the processing of compressed XML elements, which allows remote…
CVE-2014-2744 — High (CVSS 7.8): plugins/mod_compression.lua in (1) Prosody before 0.9.4 and (2) Lightwitch Metronome through 3.4 negotiates stream…
CVE-2022-0217 — High (CVSS 7.5): It was discovered that an internal Prosody library to load XML based on libexpat does not properly restrict the XML…
CVE-2021-37601 — High (CVSS 7.5): muc.lib.lua in Prosody 0.11.0 through 0.11.9 allows remote attackers to obtain sensitive information (list of admins,…
CVE-2021-32920 — High (CVSS 7.5): Prosody before 0.11.9 allows Uncontrolled CPU Consumption via a flood of SSL/TLS renegotiation requests.
CVE-2021-32919 — High (CVSS 7.5): An issue was discovered in Prosody before 0.11.9. The undocumented dialback_without_dialback option in mod_dialback…

All CVEs affecting Prosody →

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Browse all CWE-862 (Missing Authorization) vulnerabilities →