What’s Vulnerable › Vulnerabilities

CVE-2020-13111

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2020-05-16 · updated 2026-06-17
• Weakness: CWE-20

Description

NaviServer 4.99.4 to 4.99.19 allows denial of service due to the nsd/driver.c ChunkedDecode function not properly validating the length of a chunk. A remote attacker can craft a chunked-transfer request that will result in a negative value being passed to memmove via the size parameter, causing the process to crash.

Affected products

• Naviserver Project Naviserver: from 4.99.4 through 4.99.19

References

• https://bitbucket.org/naviserver/naviserver/commits/a5c3079f1d8996d5f34c9384a440acf3519ca3bb
• https://sourceforge.net/p/naviserver/bugs/89/
• https://bitbucket.org/naviserver/naviserver/commits/a5c3079f1d8996d5f34c9384a440acf3519ca3bb
• https://sourceforge.net/p/naviserver/bugs/89/

Get alerted when CVE-2020-13111 or the next vulnerability affects your stack