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Fencer Vulns
medium 6.2

CVE-2019-25544 json

Pidgin 2.13.0 Denial of Service via Malformed Username

published 2026-03-21 7 mo ago modified 2026-06-17 4 mo ago also EUVD-2019-19837

cvss
6.2
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 9%
public exploits
0
none known

Summary

Pidgin 2.13.0 contains a denial of service vulnerability that allows local attackers to crash the application by providing an excessively long username string during account creation. Attackers can input a buffer of 1000 characters in the username field and trigger a crash when joining a chat, causing the application to become unavailable.

Patch / fix

  • pidgin SLES LTSS Extended Security 12 SP5, SLES 12 SP5-LTSS 2.14.8-3.9.3
  • gssdp SLES LTSS Extended Security 12 SP5, SLES 12 SP5-LTSS 0.14.16-7.2.1
  • gupnp SLES LTSS Extended Security 12 SP5, SLES 12 SP5-LTSS 0.20.18-8.5.2
  • libgnt SLES LTSS Extended Security 12 SP5, SLES 12 SP5-LTSS 2.14.3-4.3.8
  • libnice SLES LTSS Extended Security 12 SP5, SLES 12 SP5-LTSS 0.1.13-7.2.3
  • farstream SLES LTSS Extended Security 12 SP5, SLES 12 SP5-LTSS 0.2.8-5.2.4
  • gupnp-igd SLES LTSS Extended Security 12 SP5, SLES 12 SP5-LTSS 0.2.4-6.2.2

suse advisories SUSE-SU-2026:2967-1

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-2019-25544 updated cvss 6.2

Pidgin: Pidgin: Denial of Service via excessively long username

  • Red Hat Enterprise Linux 6 finch, pidgin, libpurple, pidgin-perl, libpurple-tcl, libpurple-perl
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 7 finch, pidgin, libpurple, pidgin-perl, libpurple-tcl, libpurple-perl Red Hat Enterprise Linux 8 pidgin, libpurple
    affected: workaround, no fix available “Fix deferred”

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

CISA SSVC

Exploitation
Proof of concept is public
Automatable
no
Technical impact
partial
Assessed
7 mo ago

Exploit prediction

0.20% chance of exploitation in the next 30 days, higher than 9% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • exploit-db.com https://www.exploit-db.com/exploits/46930 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 4.0 6.9 CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
CNA 3.1 6.2 CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CNA 4.0 6.9 CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
NVD 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected products

  • Pidgin Pidgin

Classification

Weakness
  • CWE-807 Reliance on Untrusted Inputs in a Security Decision

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.