CVE-2020-28597: A predictable seed vulnerability exists in the password reset functionality of Epignosis EfrontPro 5.2.21

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HIGH 7.5REMOTEDOWNGRADE

CVE-2020-28597 is a high-severity flaw (CVSS 7.5) affecting efront. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A predictable seed vulnerability exists in the password reset functionality of Epignosis EfrontPro 5.2.21. By predicting the seed it is possible to generate the correct password reset 1-time token. An attacker can visit the password reset supplying the password reset token to reset the password of an account of their choice.

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	1.1% (top 35%)
CISA exploited list	No
Weakness	CWE-337, CWE-335
Published	2021-03-03
Last modified	2026-06-17

Publisher (CNA): Talos · Vendor: epignosishq

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

Am I affected?

Timeline

2021-03-03 18:15 UTCPublished CVE record published
2026-06-17 03:10 UTCUpdated Record last modified

epignosishq efront DOWNGRADE

Affected: 5.2.17 · 5.2.21

Fixed in: no fixed release known

Safe to downgrade to: a release before 5.2.17

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 5.2.17 (Debian / Ubuntu)

apt-cache madison efront sudo apt install efront=<VERSION_BEFORE_5.2.17> sudo apt-mark hold efront

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

dnf --showduplicates list efront sudo dnf downgrade efront-<VERSION_BEFORE_5.2.17> sudo dnf versionlock add efront

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-2020-28597?

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

Is CVE-2020-28597 being exploited?

CVE-2020-28597 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-2020-28597 affect?

CVE-2020-28597 affects efront. Severity is high (CVSS 7.5). A predictable seed vulnerability exists in the password reset functionality of Epignosis EfrontPro 5.2.21. By predicting the seed it is possible to generate the correct password reset 1-time token. An attacker can visit the password reset s

How urgent is CVE-2020-28597?

Priority 47/100. High severity; Remotely exploitable, no login, no user action

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References

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