CVE-2015-0843

yubiserver before 0.6 is prone to buffer overflows due to misuse of sprintf

Critical · published June 26, 2025

CVSS v3.1
9.8
EPSS
0%
Percentile
37.7
In the wild
Unconfirmed
What it is

🔥 A buffer overflow vulnerability in yubiserver before version 0.6 can lead to catastrophic consequences, allowing an attacker to potentially seize control of the system! Think of this as a restaurant where the chef is so eager to serve that they continuously dump extra ingredients into the main pot without checking the recipe—eventually, the pot overflows, causing a messy disaster in the kitchen! If exploited, this vulnerability could allow an attacker to overwrite critical memory data, resulting in unauthorized access and even complete system takeover. The consequences could be absolutely devastating, affecting not just the service but potentially all data handled by the server!

Put simply

Think of this as a restaurant where the chef is so eager to serve that they continuously dump extra ingredients into the main pot without checking the recipe—eventually, the pot overflows, causing a messy disaster in the kitchen! The issue arises from improper use of the `sprintf` function, which can lead to buffer overflows, enabling attackers to manipulate the memory layout and execute arbitrary code.

What to do

If exploited, this vulnerability could allow an attacker to overwrite critical memory data, resulting in unauthorized access and even complete system takeover. The consequences could be absolutely devastating, affecting not just the service but potentially all data handled by the server! To safeguard against this threat, update yubiserver to version 0.6 or later immediately. Additionally, ensure that all instances are regularly patched and monitored for unusual behavior to maintain a secure environment. You've got this! By taking these proactive steps, you're not just protecting your system—you're stepping up as a security hero! 🛡️

The record
Technical detail
CVSS v3.1
9.8 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00445 · 37.7th percentile
Published
2025-06-26T21:11Z
EPSS history
Timeline
  • 26 JUN 21:11Z
    yubiserver before 0.6 is prone to buffer overflows due to misuse of sprintf
    cvelistv5