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Fencer Vulns
high 8.1

CVE-2021-33516 json

An issue was discovered in GUPnP before 1.0.7 and 1.1.x and 1.2.x before 1.2.5.

published 2021-05-24 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-20208

cvss
8.1
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.1%
EPSS 1.1% chance of exploitation in 30 days, percentile 65%
public exploits
0
none known

Summary

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.

Patch / fix

  • gnome gupnp 1.0.7, 1.2.5
  • gupnp Debian 14, Debian 13, Debian 12 1.4.0-2

debian advisories DEBIAN-CVE-2021-33516

  • gupnp Ubuntu 20.04 LTS 1.2.3-0ubuntu0.20.04.2

ubuntu advisories UBUNTU-CVE-2021-33516

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • gupnp RHEL 7 1.0.2-6.el7_9
  • gupnp RHEL 8 1.0.6-2.el8_4
  • gupnp RHEL 8.1 EUS 1.0.3-3.el8_1
  • gupnp RHEL 8.2 EUS 1.0.3-3.el8_2

red hat advisories RHSA-2021:2459RHSA-2021:2422RHSA-2021:2417RHSA-2021:2363

  • gupnp SLE Workstation Extension 15 SP3, SLE Workstation Extension 15 SP2, SLE Module for Package Hub 15 SP3 +3 more 1.2.2-3.3.1
  • gupnp SLE Workstation Extension 12 SP5, SLE Software Development Kit 12 SP5 0.20.18-8.3.1

suse advisories SUSE-SU-2021:2153-1SUSE-SU-2021:2080-1

  • gupnp openSUSE Tumbleweed 1.2.7-2.2
  • gupnp openSUSE Leap 15.3 1.2.2-3.3.1
  • gupnp openSUSE Leap 15.2 1.2.2-lp152.2.3.1

opensuse advisories openSUSE-SU-2024:10837-1openSUSE-SU-2021:2153-1openSUSE-SU-2021:0917-1

  • gupnp AlmaLinux 8 1.0.6-2.el8_4

almalinux advisories ALSA-2021:2363

  • gupnp Rocky Linux 8 1.0.6-2.el8_4

rocky linux advisories RLSA-2021:2363

  • gupnp Arch Linux 1.2.6-1

arch linux advisories AVG-1985

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2021-33516 updated cvss 8.3

gupnp: allows DNS rebinding which could result in tricking browser into triggering actions against local UPnP services

  • Red Hat CodeReady Linux Builder (v. 8) gupnp 1.0.6-2.el8_4
    fixed: vendor fix “Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update as soon as possible.” RHSA-2021:2363
  • Red Hat CodeReady Linux Builder EUS (v. 8.1) gupnp 1.0.3-3.el8_1
    fixed: vendor fix “Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update as soon as possible.” RHSA-2021:2459
  • Red Hat CodeReady Linux Builder EUS (v. 8.2) gupnp 1.0.3-3.el8_2
    fixed: vendor fix “Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update as soon as possible.” RHSA-2021:2422
  • Red Hat Enterprise Linux AppStream (v. 8) gupnp 1.0.6-2.el8_4
    fixed: vendor fix “Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update as soon as possible.” RHSA-2021:2363
  • Red Hat Enterprise Linux AppStream EUS (v. 8.1) gupnp 1.0.3-3.el8_1
    fixed: vendor fix “Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update as soon as possible.” RHSA-2021:2459
  • Red Hat Enterprise Linux AppStream EUS (v. 8.2) gupnp 1.0.3-3.el8_2
    fixed: vendor fix “Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update as soon as possible.” RHSA-2021:2422
  • Red Hat Enterprise Linux Client (v. 7) gupnp 1.0.2-6.el7_9 Red Hat Enterprise Linux Client Optional (v. 7) gupnp 1.0.2-6.el7_9 Red Hat Enterprise Linux ComputeNode Optional (v. 7) gupnp 1.0.2-6.el7_9 Red Hat Enterprise Linux Server (v. 7) gupnp 1.0.2-6.el7_9 Red Hat Enterprise Linux Server Optional (v. 7) gupnp 1.0.2-6.el7_9 Red Hat Enterprise Linux Workstation (v. 7) gupnp 1.0.2-6.el7_9
    +1 more products
    Red Hat Enterprise Linux Workstation Optional (v. 7) gupnp 1.0.2-6.el7_9
    fixed: vendor fix “Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update as soon as possible.” RHSA-2021:2417

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

1.08% chance of exploitation in the next 30 days, higher than 65% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 8.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
NVD 2.0 5.8 AV:N/AC:M/Au:N/C:P/I:P/A:N

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.