How severe is CVE-2020-12256?

CVE-2020-12256 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-2020-12256 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 93% (100th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-12256?

CVE-2020-12256 affects Rconfig. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-12256?

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

When was CVE-2020-12256 published?

CVE-2020-12256 was published on 2020-05-18 and last updated on 2026-06-17.

CVE-2020-12256

CVE-2020-12256 is a medium-severity vulnerability in Rconfig with a CVSS 3.x base score of 5.4. Its EPSS exploit-prediction score of 93% places it in the 100th percentile, indicating an elevated likelihood of exploitation. 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: 93% (100th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Rconfig
Published: 2020-05-18
Last modified: 2026-06-17

Description

rConfig 3.9.4 is vulnerable to reflected XSS. The devicemgmnt.php file improperly validates user input. An attacker can exploit this by crafting arbitrary JavaScript in the deviceId GET parameter to devicemgmnt.php.

Frequently asked questions

What is CVE-2020-12256?: rConfig 3.9.4 is vulnerable to reflected XSS. The devicemgmnt.php file improperly validates user input. An attacker can exploit this by crafting arbitrary JavaScript in the deviceId GET parameter to devicemgmnt.php.
How severe is CVE-2020-12256?: CVE-2020-12256 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-2020-12256 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 93% (100th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-12256?: CVE-2020-12256 affects Rconfig. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-12256?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2020-12256 published?: CVE-2020-12256 was published on 2020-05-18 and last updated on 2026-06-17.

References

https://gist.github.com/farid007/8855031bad0e497264e4879efb5bc9f8

Affected products (1)

cpe:2.3:a:rconfig:rconfig:3.9.4:*:*:*:*:*:*:*

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