Medium severity · published Mar 21, 2026
CVE-2019-25544
Pidgin 2.13.0 Denial of Service via Malformed Username
5.5
CVSS
0.2%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack vector
Local
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 9% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
PI
Pidgin · Pidgin
2.13.0 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2019-25544
CVE.org
https://www.cve.org/CVERecord?id=CVE-2019-25544
Product
https://pidgin.im/
Exploit
https://www.exploit-db.com/exploits/46930
Third Party Advisory
https://www.vulncheck.com/advisories/pidgin-denial-of-service-via-malformed-username
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