CVE-2021-36121: An issue was discovered in Echo ShareCare 8.15.5

This month

HIGH 8.8DOWNGRADE

CVE-2021-36121 is a high-severity flaw (CVSS 8.8) affecting sharecare. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An issue was discovered in Echo ShareCare 8.15.5. The file-upload feature in Access/DownloadFeed_Mnt/FileUpload_Upd.cfm is susceptible to an unrestricted upload vulnerability via the name1 parameter, when processing remote input from an authenticated user, leading to the ability for arbitrary files to be written to arbitrary filesystem locations via ../ Directory Traversal on the Z: drive (a hard-coded drive letter where ShareCare application fil

Why this priority

High severity

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	2.1% (top 18%)
CISA exploited list	No
Weakness	CWE-434
Published	2021-07-13
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: echobh

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2021-07-13 14:15 UTCPublished CVE record published
2026-06-17 03:58 UTCUpdated Record last modified

echobh sharecare DOWNGRADE

Affected: 8.15.5

Fixed in: no fixed release known

Safe to downgrade to: a release before 8.15.5

1. Check installed version

apt-cache policy sharecare || rpm -q sharecare || sharecare --version

2. No fixed release: DOWNGRADE to a release before 8.15.5 (Debian / Ubuntu)

apt-cache madison sharecare sudo apt install sharecare=<VERSION_BEFORE_8.15.5> sudo apt-mark hold sharecare

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list sharecare sudo dnf downgrade sharecare-<VERSION_BEFORE_8.15.5> sudo dnf versionlock add sharecare

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-36121?

sharecare: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2021-36121 being exploited?

CVE-2021-36121 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-36121 affect?

CVE-2021-36121 affects sharecare. Severity is high (CVSS 8.8). An issue was discovered in Echo ShareCare 8.15.5. The file-upload feature in Access/DownloadFeed_Mnt/FileUpload_Upd.cfm is susceptible to an unrestricted upload vulnerability via the name1 parameter, when processing remote input from an aut

How urgent is CVE-2021-36121?

Priority 51/100. High severity

Related CVEs

CVE-2021-36124 CRITICAL 9.8 DOWNGRADE An issue was discovered in Echo ShareCare 8.15.5
CVE-2021-36123 MEDIUM 6.5 DOWNGRADE An issue was discovered in Echo ShareCare 8.15.5
CVE-2021-36122 HIGH 8.8 DOWNGRADE An issue was discovered in Echo ShareCare 8.15.5
CVE-2021-33578 CRITICAL 9.8 DOWNGRADE Echo ShareCare 8.15.5 is susceptible to SQL injection vulnerabilities when processing remote input from both a

References

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