What’s Vulnerable › Vulnerabilities

CVE-2018-15504

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.8% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2018-08-18 · updated 2026-06-17
• Weakness: CWE-476

Description

An issue was discovered in Embedthis GoAhead before 4.0.1 and Appweb before 7.0.2. The server mishandles some HTTP request fields associated with time, which results in a NULL pointer dereference, as demonstrated by If-Modified-Since or If-Unmodified-Since with a month greater than 11.

Affected products

• EmbedThis Appweb: before 7.0.2 — fixed in 7.0.2
• EmbedThis GoAhead: before 4.0.1 — fixed in 4.0.1
• Juniper Junos OS: 12.1x46, 12.1x46-d10, 12.1x46-d15, 12.1x46-d20, 12.1x46-d25, 12.1x46-d30 (+291)

How to fix

Upgrade to a fixed version: EmbedThis Appweb 7.0.2; EmbedThis GoAhead 4.0.1. Check the vendor advisory for mitigations.

References

• https://github.com/embedthis/appweb/commit/66067ae6d1fa08b37a270e7dc1821df52ed2daef
• https://github.com/embedthis/appweb/issues/605
• https://github.com/embedthis/goahead/issues/264
• https://supportportal.juniper.net/s/article/2019-07-Security-Bulletin-Junos-OS-J-Web-Denial-of-Service-due-to-multiple-vulnerabilities-in-Embedthis-Appweb-Server
• https://supportportal.juniper.net/s/article/2021-07-Security-Bulletin-Junos-OS-Multiple-J-Web-vulnerabilities-resolved
• https://github.com/embedthis/appweb/commit/66067ae6d1fa08b37a270e7dc1821df52ed2daef
• https://github.com/embedthis/appweb/issues/605
• https://github.com/embedthis/goahead/issues/264
• https://supportportal.juniper.net/s/article/2019-07-Security-Bulletin-Junos-OS-J-Web-Denial-of-Service-due-to-multiple-vulnerabilities-in-Embedthis-Appweb-Server
• https://supportportal.juniper.net/s/article/2021-07-Security-Bulletin-Junos-OS-Multiple-J-Web-vulnerabilities-resolved

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