CVE-2021-42542
No exploitation reported by the sources we read.
- Published2021-10-22
- Fixed in4.7.94
- WeaknessCWE-22
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 directory traversal due to mishandling of provided backup folder structure.
Timeline
dates in UTC- 2021-10-2214:15CVE publishedNVD
Observed activity
isMalicious corpus · updated 2026-10-23 18:48 UTCBlock these indicators
- Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2021-42542?format=txt
- CSV export: https://api.ismalicious.com/edl/cve/CVE-2021-42542?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
- CNACVSS 3.18read 2026-10-23
- NVDCVSS 3.18.8read 2026-10-23
- NVDCVSS 2.06.5read 2026-10-23
- CNAweakness (CWE)CWE-22read 2026-10-23
- FIRST EPSSEPSS score1.5 %2026-10-22
Technical details
- CVSS v3 Vector
- CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Published
- 2021-10-22
- Last Modified
- 2026-06-17
- NVD status
- Modified
Frequently asked questions
What is CVE-2021-42542?
Is CVE-2021-42542 actively exploited?
What is the CVSS score for CVE-2021-42542?
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