CVE-2021-43358: Sunnet eHRD has inadequate filtering for special characters in URLs, which allows a remote attacker to perform

This month

HIGH 7.5REMOTEDOWNGRADE

CVE-2021-43358 is a high-severity flaw (CVSS 7.5) affecting ehrd. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Sunnet eHRD has inadequate filtering for special characters in URLs, which allows a remote attacker to perform path traversal attacks without authentication, access restricted paths and download system files.

Why this priority

High severity
Remotely exploitable, no login, no user action

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

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	2.4% (top 16%)
CISA exploited list	No
Weakness	CWE-22
Published	2021-12-01
Last modified	2026-06-17

Publisher (CNA): TWCERT/CC · Vendor: sun

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

Am I affected?

Timeline

2021-12-01 02:15 UTCPublished CVE record published
2026-06-17 04:10 UTCUpdated Record last modified

sun ehrd DOWNGRADE

Affected: 8 · 9

Fixed in: no fixed release known

Safe to downgrade to: a release before 8

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 8 (Debian / Ubuntu)

apt-cache madison ehrd sudo apt install ehrd=<VERSION_BEFORE_8> sudo apt-mark hold ehrd

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

dnf --showduplicates list ehrd sudo dnf downgrade ehrd-<VERSION_BEFORE_8> sudo dnf versionlock add ehrd

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-2021-43358?

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

Is CVE-2021-43358 being exploited?

CVE-2021-43358 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-2021-43358 affect?

CVE-2021-43358 affects ehrd. Severity is high (CVSS 7.5). Sunnet eHRD has inadequate filtering for special characters in URLs, which allows a remote attacker to perform path traversal attacks without authentication, access restricted paths and download system files.

How urgent is CVE-2021-43358?

Priority 52/100. High severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2021-43360 HIGH 8.8 DOWNGRADE Sunnet eHRD e-mail delivery task schedule’s serialization function has inadequate input object validation and
CVE-2021-43359 HIGH 8.8 DOWNGRADE Sunnet eHRD has broken access control vulnerability, which allows a remote attacker to access account manageme

References

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