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Vulnerability record · CVE-2018-15505 · published 18 August 2018

CVE-2018-15505: Embedthis appweb null pointer dereference vulnerability

Embedthis · Appweb

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.

7.5 CVSS 3.1 High EPSS 2.2% · top 18.0% CWE-476 · NULL pointer dereference
7.5CVSS 3.1 base score, v2 5.0
2.2%EPSS exploitation probability, 30 days
NoNot in CISA KEV
3Affected product versions listed by NVD
8References, 4 tagged exploit
17 Jun 2026Last modified by NVD

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.

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

Affected products

3 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/embedthis/appweb/commit/16e6979c82297d5fc4f8661e7ada975f51e4dfa9 PatchThird Party Advisory
https://github.com/embedthis/appweb/issues/605 Broken LinkExploitIssue TrackingPatchThird Party Advisory
https://github.com/embedthis/goahead/issues/264 Broken LinkExploitIssue TrackingPatchThird Party Advisory
https://supportportal.juniper.net/s/article/2021-07-Security-Bulletin-Junos-OS-Multiple-J-Web-vulnerabilities-resolved?l Not Applicable
https://github.com/embedthis/appweb/commit/16e6979c82297d5fc4f8661e7ada975f51e4dfa9 PatchThird Party Advisory
https://github.com/embedthis/appweb/issues/605 Broken LinkExploitIssue TrackingPatchThird Party Advisory
https://github.com/embedthis/goahead/issues/264 Broken LinkExploitIssue TrackingPatchThird Party Advisory
https://supportportal.juniper.net/s/article/2021-07-Security-Bulletin-Junos-OS-Multiple-J-Web-vulnerabilities-resolved?l Not Applicable

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2018-15505), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.