CVE-2021-42536
No exploitation reported by the sources we read.
- Published2021-10-22
- Fixed in4.7.94
- WeaknessCWE-200 · CWE-668
Am I affected?
Debian, Ubuntu or Red Hat sometimes backport a fix without changing the upstream version number: such a version reads « to verify », never « affected ».With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.
Description
The affected product is vulnerable to a disclosure of peer username and password by allowing all users access to read global variables.
Timeline
dates in UTC- 2021-10-2214:15CVE publishedNVD
Observed activity
isMalicious corpus · updated 2026-10-23 21:37 UTCBlock these indicators
- Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2021-42536?format=txt
- CSV export: https://api.ismalicious.com/edl/cve/CVE-2021-42536?format=csv
- TAXII collection of exploited CVEs
- The EDL and CSV take an API key on the Pro plan.
Versions per branch
NVD| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 4.7 | < 4.7.94 | 4.7.94 | NVD |
| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 4.7 | < 4.7.94 | 4.7.94 | NVD |
| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 4.7 | < 4.7.94 | 4.7.94 | NVD |
as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.
Distribution builds and vendor advisories
Packages from OSV.dev and products from the vendors' CSAF advisories.
version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.
Vendor advisories
Emerson WirelessHART Gateway
WirelessHART 1420 Gateway: All versions prior to v4.7.94 · WirelessHART 1410 Gateway: All versions prior to v4.7.94 · WirelessHART 1410D Gateway: All versions prior to v4.7.94
Fix
- Update Emerson wireless 1410 gateway firmware to 4.7.94
- Mitigation from the vendor CISA ICSA-21-278-02 · 3 productsEmerson recommends upgrading to v4.7.105 to address these vulnerabilities.
- Mitigation from the vendor CISA ICSA-21-278-02 · 3 productsUsers can visit the Emerson Gate Firmware site for and download instructions.
- Mitigation from the vendor CISA ICSA-21-278-02 · 3 productsIf affected users do not yet have a free Guardian account, please see the updated Emerson Gateway Firmware download process by following the link above and viewing the download guide.
Advisories and patches
- us-cert.cisa.govPatch
Detection
- Nuclei template
- none so far ProjectDiscovery
- Exploit-DB
- no entry Exploit-DB
- Proof-of-concept repositories
- none listed PoC-in-GitHub
Sources
Technical details
- CVSS v3 Vector
- CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
- Published
- 2021-10-22
- Last Modified
- 2026-06-17
- NVD status
- Modified
Frequently asked questions
What is CVE-2021-42536?
Is CVE-2021-42536 actively exploited?
What is the CVSS score for CVE-2021-42536?
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Related vulnerabilities
Same product first, then the same vendor advisory and the same publication week.