CVE-2021-21434: Survey administrator can craft a survey in such way that malicious code can be executed in the agent interface

Routine

LOW 3.5UPGRADE

CVE-2021-21434 is a low-severity flaw (CVSS 3.5) affecting survey. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Survey administrator can craft a survey in such way that malicious code can be executed in the agent interface (i.e. another agent who wants to make changes in the survey). This issue affects: OTRS AG Survey 6.0.x version 6.0.20 and prior versions; 7.0.x version 7.0.19 and prior versions.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	3.5 (Low)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	High
User interaction	Required
EPSS exploit chance	0.7% (top 48%)
CISA exploited list	No
Weakness	CWE-79
Published	2021-02-08
Last modified	2026-06-17

Publisher (CNA): OTRS AG · Vendor: otrs

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

Am I affected?

Timeline

2021-02-08 11:15 UTCPublished CVE record published
2026-06-17 03:35 UTCUpdated Record last modified

otrs survey UPGRADE

Affected: >= 6.0.0 and <= 6.0.20 · >= 7.0.0 and <= 7.0.19

Fixed in: newer than 7.0.19

Safe to downgrade to: a release before 6.0.0

1. Check installed version

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

2. UPGRADE to newer than 7.0.19 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade survey

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade survey

Note

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

3. If no update is available yet, DOWNGRADE to a release before 6.0.0 (Debian / Ubuntu)

apt-cache madison survey sudo apt install survey=<VERSION_BEFORE_6.0.0> sudo apt-mark hold survey

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list survey sudo dnf downgrade survey-<VERSION_BEFORE_6.0.0> sudo dnf versionlock add survey

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-2021-21434?

survey: upgrade to newer than 7.0.19. Exact commands for each OS are on this page.

Is CVE-2021-21434 being exploited?

CVE-2021-21434 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-2021-21434 affect?

CVE-2021-21434 affects survey. Severity is low (CVSS 3.5). Survey administrator can craft a survey in such way that malicious code can be executed in the agent interface (i.e. another agent who wants to make changes in the survey). This issue affects: OTRS AG Survey 6.0.x version 6.0.20 and prior v

How urgent is CVE-2021-21434?

Priority 25/100. No elevated risk signals yet.

Related CVEs

CVE-2023-38057 MEDIUM 4.1 UPGRADE An improper input validation vulnerability in OTRS Survey modules allows any attacker with a link to a valid a
CVE-2021-27852 CRITICAL 9.8 EXPLOITED UPGRADE Checkbox Survey Deserialization of Untrusted Data Vulnerability

References

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