CVE-2020-13111

7.5 highEPSS 1.4%

High (7.5) in naviserver project naviserver. EPSS 1.4% chance of exploitation in the next 30 days.

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.

Severity

CVSS 3.1

7.5 high

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS: 1.4% chance of exploitation in the next 30 days; higher than 73% of CVEs (scores of 2026-10-31)
CWEs: CWE-20, CWE-787
Published: 2020-05-16
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

naviserver_project:naviserver

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/

Check your stack JSON