How severe is CVE-2021-31780?

CVE-2021-31780 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2021-31780 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (60th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-31780?

CVE-2021-31780 affects Misp-project Misp. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-31780?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-31780 published?

CVE-2021-31780 was published on 2021-04-23 and last updated on 2026-06-22.

CVE-2021-31780

CVE-2021-31780 is a high-severity vulnerability in Misp-project Misp with a CVSS 3.x base score of 7.5. 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-212.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 1% (60th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-212
Affected product: Misp-project Misp
Published: 2021-04-23
Last modified: 2026-06-22

Description

In app/Model/MispObject.php in MISP 2.4.141, an incorrect sharing group association could lead to information disclosure on an event edit. When an object has a sharing group associated with an event edit, the sharing group object is ignored and instead the passed local ID is reused.

Frequently asked questions

What is CVE-2021-31780?: In app/Model/MispObject.php in MISP 2.4.141, an incorrect sharing group association could lead to information disclosure on an event edit. When an object has a sharing group associated with an event edit, the sharing group object is ignored and instead the passed local ID is reused.
How severe is CVE-2021-31780?: CVE-2021-31780 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2021-31780 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (60th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-31780?: CVE-2021-31780 affects Misp-project Misp. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-31780?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-31780 published?: CVE-2021-31780 was published on 2021-04-23 and last updated on 2026-06-22.

References

https://github.com/MISP/MISP/commit/a0f08501d2850025892e703f40fb1570c7995478

Affected products (1)

cpe:2.3:a:misp-project:misp:2.4.141:*:*:*:*:*:*:*

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