How severe is CVE-2021-21436?

CVE-2021-21436 has a CVSS 3.x base score of 3.5, rated low severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity none, and availability none.

Is CVE-2021-21436 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (51st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-21436?

CVE-2021-21436 affects Otrs Cis In Customer Frontend. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-21436?

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

When was CVE-2021-21436 published?

CVE-2021-21436 was published on 2021-02-08 and last updated on 2026-06-17.

CVE-2021-21436

CVE-2021-21436 is a low-severity vulnerability in Otrs Cis In Customer Frontend 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-276.

Key facts

Severity: Low (CVSS 3.x base score 3.5)
CVSS v2: 4.0
EPSS exploit prediction: 1% (51st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-276
Affected product: Otrs Cis In Customer Frontend
Published: 2021-02-08
Last modified: 2026-06-17

Description

Agents are able to see and link Config Items without permissions, which are defined in General Catalog. This issue affects: OTRS AG OTRSCIsInCustomerFrontend 7.0.x version 7.0.14 and prior versions.

Frequently asked questions

What is CVE-2021-21436?: Agents are able to see and link Config Items without permissions, which are defined in General Catalog. This issue affects: OTRS AG OTRSCIsInCustomerFrontend 7.0.x version 7.0.14 and prior versions.
How severe is CVE-2021-21436?: CVE-2021-21436 has a CVSS 3.x base score of 3.5, rated low severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity none, and availability none.
Is CVE-2021-21436 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (51st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-21436?: CVE-2021-21436 affects Otrs Cis In Customer Frontend. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-21436?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-21436 published?: CVE-2021-21436 was published on 2021-02-08 and last updated on 2026-06-17.

References

https://otrs.com/release-notes/otrs-security-advisory-2021-04/

Affected products (1)

cpe:2.3:a:otrs:cis_in_customer_frontend:*:*:*:*:*:*:*:*

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