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Fencer Vulns
high 7.5

CVE-2020-25219 json

url::recvline in url.cpp in libproxy 0.4.x through 0.4.15 allows a remote HTTP server to trigger uncontrolled recursion via a response comp…

published 2020-09-09 6 y ago modified 2026-06-17 4 mo ago also EUVD-2020-17909

cvss
7.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
4.4%
EPSS 4.4% chance of exploitation in 30 days, percentile 91%
public exploits
0
none known

Summary

url::recvline in url.cpp in libproxy 0.4.x through 0.4.15 allows a remote HTTP server to trigger uncontrolled recursion via a response composed of an infinite stream that lacks a newline character. This leads to stack exhaustion.

Patch / fix

  • libproxy Debian 14, Debian 13, Debian 12 0.4.15-15

debian advisories DEBIAN-CVE-2020-25219

  • libproxy Ubuntu 16.04 LTS 0.4.11-5ubuntu1.1
  • libproxy Ubuntu 18.04 LTS 0.4.15-1ubuntu0.1
  • libproxy Ubuntu 20.04 LTS 0.4.15-10ubuntu1.1

ubuntu advisories UBUNTU-CVE-2020-25219

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

  • libproxy RHEL 8 0.4.15-5.5.el8_10
  • libproxy-bin RHEL 8 0.4.15-5.5.el8_10
  • libproxy-gnome RHEL 8 0.4.15-5.5.el8_10
  • python3-libproxy RHEL 8 0.4.15-5.5.el8_10
  • libproxy-webkitgtk4 RHEL 8 0.4.15-5.5.el8_10
  • libproxy-networkmanager RHEL 8 0.4.15-5.5.el8_10
  • libproxy RHEL 8.8 EUS 0.4.15-5.4.el8_8
  • libproxy-bin RHEL 8.8 EUS 0.4.15-5.4.el8_8

red hat advisories RHEA-2024:8852RHSA-2024:6205

  • libproxy SLES for SAP 15, SLES 15-LTSS, SLE Module for Basesystem 15 SP2 +3 more 0.4.15-4.3.1
  • libproxy-plugins SLES for SAP 15, SLES 15-LTSS, SLE Workstation Extension 15 SP2 +5 more 0.4.15-4.3.1
  • libproxy SLES for SAP 12 SP5, SLES for SAP 12 SP4, SLES for SAP 12 SP3 +15 more 0.4.13-18.3.1
  • libproxy-plugins SLES for SAP 12 SP5, SLES for SAP 12 SP4, SLES for SAP 12 SP3 +15 more 0.4.13-18.3.1

suse advisories SUSE-SU-2020:2901-1SUSE-SU-2020:2900-1

  • libproxy openSUSE Tumbleweed 0.4.17-2.2
  • libproxy openSUSE Leap 15.2 0.4.15-lp152.5.3.1
  • libproxy-plugins openSUSE Leap 15.2 0.4.15-lp152.5.3.1
  • libproxy openSUSE Leap 15.1 0.4.15-lp151.4.3.1
  • libproxy-plugins openSUSE Leap 15.1 0.4.15-lp151.4.3.1

opensuse advisories openSUSE-SU-2024:10973-1openSUSE-SU-2020:1680-1openSUSE-SU-2020:1676-1

  • libproxy Alpine 3.12 0.4.15-r7
  • libproxy Alpine 3.24, Alpine 3.23, Alpine 3.22 +9 more 0.4.15-r8

alpine advisories ALPINE-CVE-2020-25219

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • libproxy CBL-Mariner 2.0 0.4.15-20

azure linux advisories AZL-6645AZL-7270

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

  • libproxy Arch Linux 0.4.16-1

arch linux advisories AVG-1226

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-2020-25219 updated cvss 5.9

libproxy: uncontrolled recursion via an infinite stream response leading to stack exhaustion

  • Red Hat Enterprise Linux 6 libproxy, libproxy-bin, libproxy-kde, libproxy-gnome, libproxy-mozjs, libproxy-python, +1 more Red Hat Enterprise Linux 7 libproxy, libproxy-bin, libproxy-kde, libproxy-gnome, libproxy-mozjs, libproxy-python, +2 more
    affected: no fix planned “Out of support scope”
  • Red Hat CodeReady Linux Builder EUS (v.8.8) libproxy-devel 0.4.15-5.4.el8_8, libproxy-debuginfo 0.4.15-5.4.el8_8, libproxy-debugsource 0.4.15-5.4.el8_8, libproxy-bin-debuginfo 0.4.15-5.4.el8_8, libproxy-gnome-debuginfo 0.4.15-5.4.el8_8, libproxy-webkitgtk4-debuginfo 0.4.15-5.4.el8_8, +1 more
    fixed: vendor fix RHSA-2024:6205
  • Red Hat Enterprise Linux AppStream (v. 8) libproxy-bin 0.4.15-5.5.el8_10, libproxy-gnome 0.4.15-5.5.el8_10, libproxy-webkitgtk4 0.4.15-5.5.el8_10, libproxy-networkmanager 0.4.15-5.5.el8_10
    fixed: vendor fix RHEA-2024:8852
  • Red Hat Enterprise Linux AppStream EUS (v.8.8) libproxy-bin 0.4.15-5.4.el8_8, libproxy-gnome 0.4.15-5.4.el8_8, libproxy-webkitgtk4 0.4.15-5.4.el8_8, libproxy-networkmanager 0.4.15-5.4.el8_8
    fixed: vendor fix RHSA-2024:6205
  • Red Hat Enterprise Linux BaseOS (v. 8) libproxy 0.4.15-5.5.el8_10, python3-libproxy 0.4.15-5.5.el8_10
    fixed: vendor fix RHEA-2024:8852
  • Red Hat Enterprise Linux BaseOS EUS (v.8.8) libproxy 0.4.15-5.4.el8_8, python3-libproxy 0.4.15-5.4.el8_8
    fixed: vendor fix RHSA-2024:6205
  • Red Hat Enterprise Linux CRB (v. 8) libproxy-devel 0.4.15-5.5.el8_10, libproxy-debuginfo 0.4.15-5.5.el8_10, libproxy-debugsource 0.4.15-5.5.el8_10, libproxy-bin-debuginfo 0.4.15-5.5.el8_10, libproxy-gnome-debuginfo 0.4.15-5.5.el8_10, libproxy-webkitgtk4-debuginfo 0.4.15-5.5.el8_10, +1 more
    fixed: vendor fix RHEA-2024:8852

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

4.37% chance of exploitation in the next 30 days, higher than 91% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/libproxy/libproxy/issues/134 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:N/A:P

Classification

Weakness

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.