Is CVE-2021-33516 in the CISA KEV catalog?

No. CVE-2021-33516 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-33516?

CVE-2021-33516 has a CVSS v3 base score of 8.1 (HIGH).

What is the EPSS score for CVE-2021-33516?

CVE-2021-33516 has an EPSS score of 1.08% (61th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-33516?

Upgrade gupnp on debian 12 to 1.4.0-2 or later. Fixes are available for 3 affected products.

CVE & CISA-KEV Catalog

CVE-2021-33516

HIGH

8.1

CVSS v3

NVD

Description

An issue was discovered in GUPnP before 1.0.7 and 1.1.x and 1.2.x before 1.2.5. It allows DNS rebinding. A remote web server can exploit this vulnerability to trick a victim's browser into triggering actions against local UPnP services implemented using this library. Depending on the affected service, this could be used for data exfiltration, data tempering, etc.

How to fix

Remediation Available

gupnpDebian

Fixed in:1.4.0-2CVE-2021-33516

gupnpUbuntu

Fixed in:1.2.3-0ubuntu0.20.04.2USN-4970-1

libgupnp-1.2-0Ubuntu

Fixed in:1.2.3-0ubuntu0.20.04.2USN-4970-1

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionRequired

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityNone

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

Exploit Intelligence

1.08%probability of exploitation in 30 days

61stpercentile

Moderate risk: more likely to be exploited than 61% of all known CVEs.

References

Patch1

discourse.gnome.org

Vendor Advisory1

gitlab.gnome.org

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.