How severe is CVE-2021-29661?

CVE-2021-29661 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2021-29661 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (44th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-29661?

CVE-2021-29661 affects Softing Opc Toolbox. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-29661?

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

When was CVE-2021-29661 published?

CVE-2021-29661 was published on 2021-04-02 and last updated on 2026-06-17.

CVE-2021-29661

CVE-2021-29661 is a medium-severity vulnerability in Softing Opc Toolbox with a CVSS 3.x base score of 5.4. 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: Medium (CVSS 3.x base score 5.4)
CVSS v2: 3.5
EPSS exploit prediction: 1% (44th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Softing Opc Toolbox
Published: 2021-04-02
Last modified: 2026-06-17

Description

Softing AG OPC Toolbox through 4.10.1.13035 allows /en/diag_values.html Stored XSS via the ITEMLISTVALUES##ITEMID parameter, resulting in JavaScript payload injection into the trace file. This payload will then be triggered every time an authenticated user browses the page containing it.

Frequently asked questions

What is CVE-2021-29661?: Softing AG OPC Toolbox through 4.10.1.13035 allows /en/diag_values.html Stored XSS via the ITEMLISTVALUES##ITEMID parameter, resulting in JavaScript payload injection into the trace file. This payload will then be triggered every time an authenticated user browses the page containing it.
How severe is CVE-2021-29661?: CVE-2021-29661 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2021-29661 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (44th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-29661?: CVE-2021-29661 affects Softing Opc Toolbox. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-29661?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-29661 published?: CVE-2021-29661 was published on 2021-04-02 and last updated on 2026-06-17.

References

https://www.gruppotim.it/redteam

Affected products (1)

cpe:2.3:a:softing:opc_toolbox:*:*:*:*:*:*:*:*

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