CVE-2003-0545

Double free vulnerability in OpenSSL 0.9.7 allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via an SSL client…

published October 1, 2003

Patch now

High probability of exploitation

NVD has not assigned a CVSS score to this record. It sits in the 99.8th percentile for exploit probability.

CVSS
—
EPSS
87%
Percentile
99.8
In the wild
Unconfirmed
What it is

⚠️ A double free vulnerability in OpenSSL 0.9.7 could turn SSL connections into a game of Jenga — one wrong move, and the whole stack might come crashing down! Think of it like a restaurant where the chef accidentally throws away the same ingredient twice. Instead of saving it for later, the kitchen ends up in chaos — orders get lost, and dishes can’t be prepared. This bug can cause a denial of service, leading to unexpected crashes. With this vulnerability, an attacker could send a specially crafted SSL client certificate that causes a server to crash. While the immediate threat is a denial of service, the door is also ajar for possible arbitrary code execution. That's a dangerous recipe for disaster!

Put simply

Think of it like a restaurant where the chef accidentally throws away the same ingredient twice. Instead of saving it for later, the kitchen ends up in chaos — orders get lost, and dishes can’t be prepared. This bug can cause a denial of service, leading to unexpected crashes. This double free vulnerability allows remote attackers to manipulate memory by sending an SSL client certificate with an invalid ASN.1 encoding, leading to potential crashes or arbitrary code execution.

What to do

With this vulnerability, an attacker could send a specially crafted SSL client certificate that causes a server to crash. While the immediate threat is a denial of service, the door is also ajar for possible arbitrary code execution. That's a dangerous recipe for disaster! To protect against this vulnerability, upgrade OpenSSL to a version later than 0.9.7 immediately. Regularly audit your SSL configurations and ensure that all certificates are correctly encoded. Keeping your libraries up-to-date is key! You've got this! Follow these steps, and you'll be on your way to fortifying your security! 🛡️

The record
Technical detail
CVSS
Not scored
CVSS v4.0
Not supplied
EPSS
0.87499 · 99.8th percentile
Published
2003-10-01T04:00Z
EPSS history
Timeline
  • 01 OCT 04:00Z
    Double free vulnerability in OpenSSL 0.9.7 allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via an SSL client…
    cvelistv5