How severe is CVE-2021-23772?

CVE-2021-23772 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-23772 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (76th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-23772?

CVE-2021-23772 primarily affects Iris-go Iris. In total, 6 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-23772?

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-2021-23772 published?

CVE-2021-23772 was published on 2021-12-24 and last updated on 2026-06-17.

CVE-2021-23772

CVE-2021-23772 is a high-severity vulnerability in Iris-go Iris 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-59.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 6.8
EPSS exploit prediction: 2% (76th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-59
Affected product: Iris-go Iris
Published: 2021-12-24
Last modified: 2026-06-17

Description

This affects all versions of package github.com/kataras/iris; all versions of package github.com/kataras/iris/v12. The unsafe handling of file names during upload using UploadFormFiles method may enable attackers to write to arbitrary locations outside the designated target folder.

Frequently asked questions

What is CVE-2021-23772?: This affects all versions of package github.com/kataras/iris; all versions of package github.com/kataras/iris/v12. The unsafe handling of file names during upload using UploadFormFiles method may enable attackers to write to arbitrary locations outside the designated target folder.
How severe is CVE-2021-23772?: CVE-2021-23772 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-23772 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (76th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-23772?: CVE-2021-23772 primarily affects Iris-go Iris. In total, 6 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-23772?: 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-2021-23772 published?: CVE-2021-23772 was published on 2021-12-24 and last updated on 2026-06-17.

References

Affected products (6)

cpe:2.3:a:iris-go:iris:*:*:*:*:*:go:*:*
cpe:2.3:a:iris-go:iris:12.2.0:alpha:*:*:*:go:*:*
cpe:2.3:a:iris-go:iris:12.2.0:alpha2:*:*:*:go:*:*
cpe:2.3:a:iris-go:iris:12.2.0:alpha3:*:*:*:go:*:*
cpe:2.3:a:iris-go:iris:12.2.0:alpha4:*:*:*:go:*:*
cpe:2.3:a:iris-go:iris:12.2.0:alpha5:*:*:*:go:*:*

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