CVE-2020-5622: Shadankun Server Security Type (excluding normal blocking method types) Ver.1.5.3 and earlier allows remote at

Q: How do I fix CVE-2020-5622?

server security type: upgrade to newer than 1.5.3. Exact commands for each OS are on this page.

Q: Is CVE-2020-5622 being exploited?

CVE-2020-5622 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2020-5622 affect?

CVE-2020-5622 affects server security type. Severity is high (CVSS 7.5). Shadankun Server Security Type (excluding normal blocking method types) Ver.1.5.3 and earlier allows remote attackers to cause a denial of service which may result in not being able to add newly detected attack source IP addresses as blocki

Q: How urgent is CVE-2020-5622?

Priority 49/100. High severity; Remotely exploitable, no login, no user action

This month

HIGH 7.5REMOTEUPGRADE

CVE-2020-5622 is a high-severity flaw (CVSS 7.5) affecting server security type. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Shadankun Server Security Type (excluding normal blocking method types) Ver.1.5.3 and earlier allows remote attackers to cause a denial of service which may result in not being able to add newly detected attack source IP addresses as blocking targets for about 10 minutes via a specially crafted request.

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.3% (top 30%)
CISA exploited list	No
Published	2020-09-02
Last modified	2026-06-17

Publisher (CNA): JPCERT/CC · Vendor: shadan-kun

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

Am I affected?

Timeline

2020-09-02 05:15 UTCPublished CVE record published
2026-06-17 03:21 UTCUpdated Record last modified

shadan-kun server security type UPGRADE

Affected: <= 1.5.3

Fixed in: newer than 1.5.3

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy server-security-type || rpm -q server-security-type || server-security-type --version

2. UPGRADE to newer than 1.5.3 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade server-security-type

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade server-security-type

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

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-2020-5622?

server security type: upgrade to newer than 1.5.3. Exact commands for each OS are on this page.

Is CVE-2020-5622 being exploited?

CVE-2020-5622 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-2020-5622 affect?

CVE-2020-5622 affects server security type. Severity is high (CVSS 7.5). Shadankun Server Security Type (excluding normal blocking method types) Ver.1.5.3 and earlier allows remote attackers to cause a denial of service which may result in not being able to add newly detected attack source IP addresses as blocki

How urgent is CVE-2020-5622?

Priority 49/100. High severity; Remotely exploitable, no login, no user action

References

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