How severe is CVE-2021-21434?

CVE-2021-21434 has a CVSS 3.x base score of 3.5, rated low severity. It is exploitable over network with low attack complexity, requires high privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2021-21434 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (47th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-21434?

CVE-2021-21434 affects Otrs Survey. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-21434?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-21434 published?

CVE-2021-21434 was published on 2021-02-08 and last updated on 2026-06-17.

CVE-2021-21434

CVE-2021-21434 is a low-severity vulnerability in Otrs Survey with a CVSS 3.x base score of 3.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.

Key facts

Severity: Low (CVSS 3.x base score 3.5)
CVSS v2: 3.5
EPSS exploit prediction: 1% (47th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Otrs Survey
Published: 2021-02-08
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is CVE-2021-21434?: 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.
How severe is CVE-2021-21434?: CVE-2021-21434 has a CVSS 3.x base score of 3.5, rated low severity. It is exploitable over network with low attack complexity, requires high privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2021-21434 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (47th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-21434?: CVE-2021-21434 affects Otrs Survey. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-21434?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-21434 published?: CVE-2021-21434 was published on 2021-02-08 and last updated on 2026-06-17.

References

https://otrs.com/release-notes/otrs-security-advisory-2021-01/

Affected products (1)

cpe:2.3:a:otrs:survey:*:*:*:*:*:*:*:*

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