CVE-2021-42342: An issue was discovered in GoAhead 4.x and 5.x before 5.1.5.
Noroxi assessment
Priority: Plan (action score 57/100)
- Public proof-of-concept code exists (GitHub); there is no record of exploitation in the wild.
- Probability of exploitation in the next 30 days: 59.4% (FIRST EPSS); higher than 99.1% of all records.
- 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.
- According to the record, no fixed version is available yet.
Add it to your regular patch cycle. Update when a fix is released; follow the vendor's advisory.
Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it
Primary sources: NVD · CVE.org · FIRST EPSS
An issue was discovered in GoAhead 4.x and 5.x before 5.1.5. In the file upload filter, user form variables can be passed to CGI scripts without being prefixed with the CGI prefix. This permits tunneling untrusted environment variables into vulnerable CGI scripts.
- Published
- Oct 14, 2021
- Updated
- Jun 17, 2026
- EPSS
- 59.4% · 99th percentile
- CWE
- CWE-434
Report tools
Action score
57
Add it to your regular patch cycle.
- CVSS
- 39 / 40 · 9.8 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 18 / 30 · 59.4%
Get told when this record changes
- Not in KEV: no record of exploitation in the wild
- Proof of concept exists, no weaponized module
- No fixed version yet
If any of these changes, we'll tell you in the daily email digest.
Is your version affected? Check itNoroxi analysis
What does it mean in your environment?
The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.
We use this product, ask for helpAffected systems
Is your version affected?
Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.
| Vendor | Product | CPE |
|---|---|---|
| embedthis | goahead | cpe:2.3:a:embedthis:goahead |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- embedthis goahead4.0.0 and later · up to 4.1.3 inclusive
- embedthis goahead5.0.0 and later · before 5.1.5
Same product
embedthis: all recordsOther highest-scoring records for the same primary product.
- CVE-2017-17562Embedthis GoAhead before 3.6.5 allows remote code execution if CGI is enabled and a CGI program is dynamically linked.KEV91Now
- CVE-2019-5096An exploitable code execution vulnerability exists in the processing of multi-part/form-data requests within the base GoAhead web server…59Plan
- CVE-2017-5674A vulnerability in a custom-built GoAhead web server used on Foscam, Vstarcam, and multiple white-label IP camera models allows an attacker…45Plan
Published before and after this one in the same product
- ← EarlierCVE-2019-5097Dec 3, 2019 · A denial-of-service vulnerability exists in the processing of multi-part/form-data requests in the base GoAhead web server application in…44Plan
- ← EarlierCVE-2020-15688Jul 23, 2020 · The HTTP Digest Authentication in the GoAhead web server before 5.1.2 does not completely protect against replay attacks.36Monitor
- Later →CVE-2021-43298Jan 25, 2022 · The code that performs password matching when using 'Basic' HTTP authentication does not use a constant-time memcmp and has no…40Plan
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
Proof of concept available
A public proof of concept or detection signature exists. Exploit knowledge is out there; don't delay patching.
Evidence
- Proof-of-concept repository on GitHub ×2
Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.
| Source | Kind | Date |
|---|---|---|
| Proof-of-concept repository on GitHub | stars:23 | 2021-10-12 |
| Proof-of-concept repository on GitHub | stars:41 | 2022-01-04 |
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.
- First PoC-2 d
- Published
- TodayNov 12, 2026+1856 d
Not on record for this CVE: EPSS history · patch commit or PR link · researcher credit · variant or chain candidate · public bounty program.
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
- high · data can be read
- Integrity
- high · data or configuration can be modified
- Availability
- high · the service can be disrupted
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- High
- Integrity impact
- High
- Availability impact
- High
Weakness class (CWE)
CWE-434 · Unrestricted Upload of File with Dangerous TypeCVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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.
Attack patterns (CAPEC)
ATT&CK techniques
Change log (0)
No changes recorded on tracked fields yet. Score, KEV, exploit maturity and fix status changes appear here.
References
Vendor advisories and official records. Exploit/PoC links are deliberately left out.