How severe is CVE-2021-4259?

CVE-2021-4259 has a CVSS 3.x base score of 5.0, rated medium severity. It is exploitable over an adjacent network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability low.

Is CVE-2021-4259 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-2021-4259?

CVE-2021-4259 affects Phpredisadmin Project Phpredisadmin. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-4259?

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

When was CVE-2021-4259 published?

CVE-2021-4259 was published on 2022-12-19 and last updated on 2026-06-17.

CVE-2021-4259

CVE-2021-4259 is a medium-severity vulnerability in Phpredisadmin Project Phpredisadmin with a CVSS 3.x base score of 5.0. 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-597.

Key facts

Severity: Medium (CVSS 3.x base score 5.0)
EPSS exploit prediction: 1% (51st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-597
Affected product: Phpredisadmin Project Phpredisadmin
Published: 2022-12-19
Last modified: 2026-06-17

Description

A vulnerability was found in phpRedisAdmin up to 1.16.1. It has been classified as problematic. This affects the function authHttpDigest of the file includes/login.inc.php. The manipulation of the argument response leads to use of wrong operator in string comparison. Upgrading to version 1.16.2 is able to address this issue. The name of the patch is 31aa7661e6db6f4dffbf9a635817832a0a11c7d9. It is recommended to upgrade the affected component. The associated identifier of this vulnerability is VDB-216267.

Frequently asked questions

What is CVE-2021-4259?: A vulnerability was found in phpRedisAdmin up to 1.16.1. It has been classified as problematic. This affects the function authHttpDigest of the file includes/login.inc.php. The manipulation of the argument response leads to use of wrong operator in string comparison. Upgrading to version 1.16.2 is able to address this issue. The name of the patch is 31aa7661e6db6f4dffbf9a635817832a0a11c7d9. It is recommended to upgrade the affected component. The associated identifier of this vulnerability is VDB-216267.
How severe is CVE-2021-4259?: CVE-2021-4259 has a CVSS 3.x base score of 5.0, rated medium severity. It is exploitable over an adjacent network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability low.
Is CVE-2021-4259 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-2021-4259?: CVE-2021-4259 affects Phpredisadmin Project Phpredisadmin. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-4259?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-4259 published?: CVE-2021-4259 was published on 2022-12-19 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:phpredisadmin_project:phpredisadmin:*:*:*:*:*:*:*:*

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CVE-2020-27163 — Medium (CVSS 6.1): phpRedisAdmin before 1.13.2 allows XSS via the login.php username parameter.
CVE-2021-4268 — Medium (CVSS 4.3): A vulnerability, which was classified as problematic, was found in phpRedisAdmin up to 1.17.3. This affects an unknown…

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