CVE-2020-5541: Open redirect vulnerability in CyberMail Ver.6.x and Ver.7.x allows remote attackers to redirect users to arbi

Routine

MEDIUM 6.1DOWNGRADE

CVE-2020-5541 is a medium-severity flaw (CVSS 6.1) affecting cybermail. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Open redirect vulnerability in CyberMail Ver.6.x and Ver.7.x allows remote attackers to redirect users to arbitrary sites and conduct phishing attacks via a specially crafted URL.

Why this priority

No elevated risk signals yet

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

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	1.4% (top 28%)
CISA exploited list	No
Weakness	CWE-601
Published	2020-08-25
Last modified	2026-06-17

Publisher (CNA): JPCERT/CC · Vendor: cybersolutions

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

Am I affected?

Timeline

2020-08-25 03:15 UTCPublished CVE record published
2026-06-17 03:21 UTCUpdated Record last modified

cybersolutions cybermail DOWNGRADE

Affected: 6.0 · 7.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 6.0

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 6.0 (Debian / Ubuntu)

apt-cache madison cybermail sudo apt install cybermail=<VERSION_BEFORE_6.0> sudo apt-mark hold cybermail

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

dnf --showduplicates list cybermail sudo dnf downgrade cybermail-<VERSION_BEFORE_6.0> sudo dnf versionlock add cybermail

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-2020-5541?

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

Is CVE-2020-5541 being exploited?

CVE-2020-5541 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-2020-5541 affect?

CVE-2020-5541 affects cybermail. Severity is medium (CVSS 6.1). Open redirect vulnerability in CyberMail Ver.6.x and Ver.7.x allows remote attackers to redirect users to arbitrary sites and conduct phishing attacks via a specially crafted URL.

How urgent is CVE-2020-5541?

Priority 39/100. No elevated risk signals yet.

Related CVEs

CVE-2020-5540 MEDIUM 6.1 DOWNGRADE Cross-site scripting vulnerability in CyberMail Ver.6.x and Ver.7.x allows remote attackers to inject arbitrar
CVE-2020-11734 MEDIUM 6.1 DOWNGRADE cgi-bin/go in CyberSolutions CyberMail 5 or later allows XSS via the ACTION parameter.

References

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