How severe is CVE-2021-25977?

CVE-2021-25977 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-2021-25977 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (46th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-25977?

CVE-2021-25977 affects Dotnetfoundation Piranha Cms. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-25977?

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

When was CVE-2021-25977 published?

CVE-2021-25977 was published on 2021-10-25 and last updated on 2026-06-17.

CVE-2021-25977

CVE-2021-25977 is a medium-severity vulnerability in Dotnetfoundation Piranha Cms 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% (46th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Dotnetfoundation Piranha Cms
Published: 2021-10-25
Last modified: 2026-06-17

Description

In PiranhaCMS, versions 7.0.0 to 9.1.1 are vulnerable to stored XSS due to the page title improperly sanitized. By creating a page with a specially crafted page title, a low privileged user can trigger arbitrary JavaScript execution.

Frequently asked questions

What is CVE-2021-25977?: In PiranhaCMS, versions 7.0.0 to 9.1.1 are vulnerable to stored XSS due to the page title improperly sanitized. By creating a page with a specially crafted page title, a low privileged user can trigger arbitrary JavaScript execution.
How severe is CVE-2021-25977?: CVE-2021-25977 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-2021-25977 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (46th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-25977?: CVE-2021-25977 affects Dotnetfoundation Piranha Cms. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-25977?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-25977 published?: CVE-2021-25977 was published on 2021-10-25 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:dotnetfoundation:piranha_cms:*:*:*:*:*:*:*:*

More vulnerabilities in Dotnetfoundation Piranha Cms

CVE-2021-25976 — High (CVSS 8.1): In PiranhaCMS, versions 4.0.0-alpha1 to 9.2.0 are vulnerable to cross-site request forgery (CSRF) when performing…
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CVE-2025-61413 — Medium (CVSS 6.1): A stored cross-site scripting (XSS) vulnerability in the /manager/pages component of Piranha CMS v12.0 allows attackers…
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