An issue was discovered in Embedthis GoAhead before 4.0.1 and Appweb before 7.0.2.
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.
- Published
- Aug 17, 2018
- Updated
- Jun 16, 2026
- EPSS
- 2.8% · 86th percentile
- CWE
- CWE-476
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Report tools
Action score
31
Monitor
Low priority for now.
- CVSS
- 30 / 40 · 7.5 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 1 / 30 · 2.8%
Affected systems
| Vendor | Product | CPE |
|---|---|---|
| embedthis | appweb | cpe:2.3:a:embedthis:appweb |
| embedthis | goahead | cpe:2.3:a:embedthis:goahead |
| juniper | junos | cpe:2.3:o:juniper:junos |
| juniper | srx100 | cpe:2.3:h:juniper:srx100 |
| juniper | srx110 | cpe:2.3:h:juniper:srx110 |
| juniper | srx1400 | cpe:2.3:h:juniper:srx1400 |
| juniper | srx1500 | cpe:2.3:h:juniper:srx1500 |
| juniper | srx210 | cpe:2.3:h:juniper:srx210 |
| juniper | srx220 | cpe:2.3:h:juniper:srx220 |
| juniper | srx240 | cpe:2.3:h:juniper:srx240 |
| juniper | srx240h2 | cpe:2.3:h:juniper:srx240h2 |
| juniper | srx240m | cpe:2.3:h:juniper:srx240m |
and 122 more
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- embedthis appwebbefore 7.0.2
- embedthis goaheadbefore 4.0.1
- juniper junos12.1x46
- juniper junos12.3
- juniper junos12.3x48
- juniper junos15.1
- juniper junos15.1x49
- juniper junos15.1x53
- juniper junos16.1
- juniper junos16.2
- juniper junos17.1
- juniper junos17.2
- juniper junos17.3
- juniper junos17.4
- juniper junos18.1
- juniper junos18.2
- juniper junos18.3
- juniper junos18.4
Same product
embedthis: all recordsOther highest-scoring records for the same primary product.
- CVE-2018-8715The Embedthis HTTP library, and Appweb versions before 7.0.3, have a logic flaw related to the authCondition function in http/httpLib.c.39Monitor
- CVE-2014-9708Embedthis Appweb before 4.6.6 and 5.x before 5.2.1 allows remote attackers to cause a denial of service (NULL pointer dereference) via a Ran37Monitor
- CVE-2018-15505An issue was discovered in Embedthis GoAhead before 4.0.1 and Appweb before 7.0.2.31Monitor
- CVE-2021-33254An issue was discovered in src/http/httpLib.c in EmbedThis Appweb Community Edition 8.2.1, allows attackers to cause a denial of service via30Monitor
- CVE-2020-15689Appweb before 7.2.2 and 8.x before 8.1.0, when built with CGI support, mishandles an HTTP request with a Range header that lacks an exact ra30Monitor
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
No fix version is recorded for this entry. Check the references for vendor advisories.
Exploit status
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
No dated events beyond publication.
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
No credits in the CNA record.
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
No nightly-computed relations.
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
Technical details
Attack conditions
- Anyone who can reach it over the internet can trigger it.
- No account or password is required.
- No user action is required.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- none
- Integrity
- none
- Availability
- high · the service can be disrupted
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- None
- Integrity impact
- None
- Availability impact
- High
Weakness class (CWE)
CWE-476 · NULL Pointer DereferenceCVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
nvd-primary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
MITRE has no CAPEC/ATT&CK mapping for this CWE.
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.
We use this product, ask for helpChange log
No changes recorded on tracked fields yet. Score, KEV, exploit maturity and fix status changes appear here.
References
- github.com/embedthis/appweb/commit/66067ae6d1fa08b37a270e7dc1821df52ed2daef
- supportportal.juniper.net/s/article/2019-07-Security-Bulletin-Junos-OS-J-Web-Denial-of-Service-due-to-multiple-vulnerabilities-in-Embedthis-Appweb-Server
- supportportal.juniper.net/s/article/2021-07-Security-Bulletin-Junos-OS-Multiple-J-Web-vulnerabilities-resolved
Vendor advisories and official records. Exploit/PoC links are deliberately left out.