CVE-2018-15505

Name: CVE-2018-15505
Creator: NVD / NIST
Published: 2018-08-18T03:29:00.457+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 2.23%

Last modified Jun 17, 2026

CVE-2018-15505 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. An issue was discovered in Embedthis GoAhead before 4.0.1 and Appweb before 7.0.2. An HTTP POST request with a specially crafted "Host" header field may cause a NULL pointer dereference and thus cause a denial of service, as demonstrated by the lack of a trailing ']' character in an IPv6 address.. EPSS estimates a 2.23% chance of exploitation in the next 30 days.

Description

An issue was discovered in Embedthis GoAhead before 4.0.1 and Appweb before 7.0.2. An HTTP POST request with a specially crafted "Host" header field may cause a NULL pointer dereference and thus cause a denial of service, as demonstrated by the lack of a trailing ']' character in an IPv6 address.

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

2.23%

80.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-476

Affected Software

Vendor	Product	Versions
Embedthis	Appweb	< 7.0.2
Embedthis	Goahead	< 4.0.1
Juniper	Junos	12.3
Juniper	Junos	12.3x48
Juniper	Junos	15.1
Juniper	Junos	15.1x49
Juniper	Junos	15.1x53
Juniper	Junos	16.1
Juniper	Junos	16.2
Juniper	Junos	17.1
Juniper	Junos	17.2
Juniper	Junos	17.3
Juniper	Junos	17.4
Juniper	Junos	18.1

References

https://github.com/embedthis/appweb/commit/16e6979c82297d5fc4f8661e7ada975f51e4dfa9Patch, Third Party Advisory
https://github.com/embedthis/appweb/issues/605Broken Link, Exploit, Issue Tracking, Patch, Third Party Advisory
https://github.com/embedthis/goahead/issues/264Broken Link, Exploit, Issue Tracking, Patch, Third Party Advisory
https://supportportal.juniper.net/s/article/2021-07-Security-Bulletin-Junos-OS-Multiple-J-Web-vulnerabilities-resolved?language=en_USNot Applicable
https://github.com/embedthis/appweb/commit/16e6979c82297d5fc4f8661e7ada975f51e4dfa9Patch, Third Party Advisory
https://github.com/embedthis/appweb/issues/605Broken Link, Exploit, Issue Tracking, Patch, Third Party Advisory
https://github.com/embedthis/goahead/issues/264Broken Link, Exploit, Issue Tracking, Patch, Third Party Advisory
https://supportportal.juniper.net/s/article/2021-07-Security-Bulletin-Junos-OS-Multiple-J-Web-vulnerabilities-resolved?language=en_USNot Applicable

Timeline

Published: Aug 18, 2018
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2018-15505?

How severe is CVE-2018-15505?

CVE-2018-15505 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 2.23% probability of exploitation in the next 30 days.

How do I fix CVE-2018-15505?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2018-15505?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST