CVE-2021-39275

ap_escape_quotes buffer overflow

published September 16, 2021

CVSS
โ€”
EPSS
39%
Percentile
98.6
In the wild
Unconfirmed
What it is

โš ๏ธ A sneaky buffer overflow vulnerability lurks in Apache HTTP Server! If a third-party module passes malicious data, it could potentially cause chaos. ๐Ÿ”ฅ Think of it like a waiter trying to cram too many orders into a single takeout bag โ€” if the bag bursts, everything spills out, leading to a mess and unhappy customers. In this case, untrustworthy inputs can overflow the buffer and wreak havoc! An attacker sending carefully crafted data could lead to unexpected behavior, potentially crashing your server or causing security breaches. While no modules currently known to be vulnerable pass untrusted data, the risk remains if external modules are involved. This could be absolutely devastating if exploited!

Put simply

Think of it like a waiter trying to cram too many orders into a single takeout bag โ€” if the bag bursts, everything spills out, leading to a mess and unhappy customers. In this case, untrustworthy inputs can overflow the buffer and wreak havoc! The issue lies within the ap_escape_quotes() function, which might write beyond the end of a buffer when fed malicious inputs. This flaw affects Apache HTTP Server versions 2.4.48 and earlier.

What to do

An attacker sending carefully crafted data could lead to unexpected behavior, potentially crashing your server or causing security breaches. While no modules currently known to be vulnerable pass untrusted data, the risk remains if external modules are involved. This could be absolutely devastating if exploited! To mitigate this risk, upgrade to the latest Apache HTTP Server version immediately. Also, review any third-party modules you're using to ensure they handle data safely. Don't let your server become a casualty! You've got this! By taking these steps, you can protect your server and maintain security hero status. ๐Ÿ›ก๏ธ

The record
Technical detail
CVSS
Not scored
CVSS v4.0
Not supplied
EPSS
0.39402 ยท 98.6th percentile
Published
2021-09-16T14:40Z
EPSS history
Timeline
  • 16 SEP 14:40Z
    ap_escape_quotes buffer overflow
    cvelistv5