How severe is CVE-2018-15505?

CVE-2018-15505 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2018-15505 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (81st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-15505?

CVE-2018-15505 primarily affects Embedthis Appweb. In total, 225 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2018-15505?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2018-15505 published?

CVE-2018-15505 was published on 2018-08-18 and last updated on 2026-06-17.

CVE-2018-15505

CVE-2018-15505 is a high-severity vulnerability in Embedthis Appweb with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-476.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 2% (81st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-476
Affected product: Embedthis Appweb
Published: 2018-08-18
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2018-15505?: 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.
How severe is CVE-2018-15505?: CVE-2018-15505 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2018-15505 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (81st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-15505?: CVE-2018-15505 primarily affects Embedthis Appweb. In total, 225 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2018-15505?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2018-15505 published?: CVE-2018-15505 was published on 2018-08-18 and last updated on 2026-06-17.

References

Affected products (225)

cpe:2.3:a:embedthis:appweb:*:*:*:*:*:*:*:*
cpe:2.3:a:embedthis:goahead:*:*:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:12.3:-:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:12.3:r1:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:12.3:r10:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:12.3:r10-s1:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:12.3:r10-s2:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:12.3:r11:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:12.3:r12:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:12.3:r12-s1:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:12.3:r12-s10:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:12.3:r12-s11:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:12.3:r12-s12:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:12.3:r12-s13:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:12.3:r12-s20:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:12.3:r12-s3:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:12.3:r12-s4:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:12.3:r12-s6:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:12.3:r12-s8:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:12.3x48:-:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:12.3x48:d10:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:12.3x48:d15:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:12.3x48:d20:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:12.3x48:d25:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:12.3x48:d30:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:12.3x48:d35:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:12.3x48:d40:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:12.3x48:d45:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:12.3x48:d50:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:12.3x48:d51:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:12.3x48:d55:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:12.3x48:d60:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:12.3x48:d65:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:12.3x48:d66:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:12.3x48:d70:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:12.3x48:d75:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:15.1:-:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:15.1:a1:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:15.1:f:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:15.1:f1:*:*:*:*:*:*

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CVE-2021-33254 — High (CVSS 7.5): An issue was discovered in src/http/httpLib.c in EmbedThis Appweb Community Edition 8.2.1, allows attackers to cause a…
CVE-2020-15689 — High (CVSS 7.5): Appweb before 7.2.2 and 8.x before 8.1.0, when built with CGI support, mishandles an HTTP request with a Range header…
CVE-2018-15504 — High (CVSS 7.5): An issue was discovered in Embedthis GoAhead before 4.0.1 and Appweb before 7.0.2. The server mishandles some HTTP…
CVE-2014-9708 — Medium (CVSS 5.0): Embedthis Appweb before 4.6.6 and 5.x before 5.2.1 allows remote attackers to cause a denial of service (NULL pointer…

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