CVE-2020-9351: An issue was discovered in SmartClient 12.0

This week

MEDIUM 5.3REMOTEDOWNGRADE

CVE-2020-9351 is a medium-severity flaw (CVSS 5.3) affecting smartclient. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An issue was discovered in SmartClient 12.0. If an unauthenticated attacker makes a POST request to /tools/developerConsoleOperations.jsp or /isomorphic/IDACall with malformed XML data in the _transaction parameter, the server replies with a verbose error showing where the application resides (the absolute path). NOTE: the documentation states "These tools are, by default, available to anyone ... so they should only be deployed into a trusted env

Why this priority

Public exploit reference
Remotely exploitable, no login, no user action

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

Risk facts

CVSS score	5.3 (Medium)
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-209
Published	2020-02-23
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: smartclient

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

Am I affected?

Timeline

2020-02-23 02:15 UTCPublished CVE record published
2026-06-17 03:27 UTCUpdated Record last modified

smartclient smartclient DOWNGRADE

Affected: 12.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 12.0

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 12.0 (Debian / Ubuntu)

apt-cache madison smartclient sudo apt install smartclient=<VERSION_BEFORE_12.0> sudo apt-mark hold smartclient

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

dnf --showduplicates list smartclient sudo dnf downgrade smartclient-<VERSION_BEFORE_12.0> sudo dnf versionlock add smartclient

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-2020-9351?

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

Is CVE-2020-9351 being exploited?

CVE-2020-9351 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-2020-9351 affect?

CVE-2020-9351 affects smartclient. Severity is medium (CVSS 5.3). An issue was discovered in SmartClient 12.0. If an unauthenticated attacker makes a POST request to /tools/developerConsoleOperations.jsp or /isomorphic/IDACall with malformed XML data in the _transaction parameter, the server replies with

How urgent is CVE-2020-9351?

Priority 45/100. Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2020-9354 HIGH 7.5 DOWNGRADE An issue was discovered in SmartClient 12.0
CVE-2020-9353 HIGH 7.5 DOWNGRADE An issue was discovered in SmartClient 12.0
CVE-2020-9352 CRITICAL 9.8 DOWNGRADE An issue was discovered in SmartClient 12.0

References

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