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CVE-2020-12775: Hicos citizen certificate client-side component does not filter special characters for command parameters in s

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This week
CRITICAL 9.8REMOTEUPGRADEUPGRADE

CVE-2020-12775 is a critical-severity flaw (CVSS 9.8) affecting hicos, hicos. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Hicos citizen certificate client-side component does not filter special characters for command parameters in specific web URLs. An unauthenticated remote attacker can exploit this vulnerability to perform command injection attack to execute arbitrary system command, disrupt system or terminate service.

Why this priority

  • Critical severity
  • Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score9.8 (Critical)
Attack vectorNetwork (remote)
Attack complexityLow
Privileges neededNone
User interactionNone
EPSS exploit chance2.8% (top 14%)
CISA exploited listNo
WeaknessCWE-78
Published2022-03-01
Last modified2026-06-17
Publisher (CNA): TWCERT/CC · Vendor: moica

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

Am I affected?

Timeline

moica hicos UPGRADE
Affected: <= 1.3.4.12
Fixed in: newer than 1.3.4.12
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy hicos || rpm -q hicos || hicos --version
2. UPGRADE to newer than 1.3.4.12 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade hicos
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade hicos
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.
moica hicos UPGRADE
Affected: <= 3.0.0
Fixed in: newer than 3.0.0
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy hicos || rpm -q hicos || hicos --version
2. UPGRADE to newer than 3.0.0 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade hicos
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade hicos
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-2020-12775?

hicos: upgrade to newer than 1.3.4.12; hicos: upgrade to newer than 3.0.0. Exact commands for each OS are on this page.

Is CVE-2020-12775 being exploited?

CVE-2020-12775 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-2020-12775 affect?

CVE-2020-12775 affects hicos, hicos. Severity is critical (CVSS 9.8). Hicos citizen certificate client-side component does not filter special characters for command parameters in specific web URLs. An unauthenticated remote attacker can exploit this vulnerability to perform command injection attack to execute

How urgent is CVE-2020-12775?

Priority 61/100. Critical severity; Remotely exploitable, no login, no user action

References

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