How severe is CVE-2020-12258?

CVE-2020-12258 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.

Is CVE-2020-12258 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (75th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-12258?

CVE-2020-12258 affects Rconfig. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-12258?

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

When was CVE-2020-12258 published?

CVE-2020-12258 was published on 2020-05-18 and last updated on 2026-06-17.

CVE-2020-12258

CVE-2020-12258 is a critical-severity vulnerability in Rconfig with a CVSS 3.x base score of 9.1. 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-384.

Key facts

Severity: Critical (CVSS 3.x base score 9.1)
CVSS v2: 6.4
EPSS exploit prediction: 2% (75th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-384
Affected product: Rconfig
Published: 2020-05-18
Last modified: 2026-06-17

Description

rConfig 3.9.4 is vulnerable to session fixation because session expiry and randomization are mishandled. The application can reuse a session via PHPSESSID. Also, an attacker can exploit this vulnerability in conjunction with CVE-2020-12256 or CVE-2020-12259.

Frequently asked questions

What is CVE-2020-12258?: rConfig 3.9.4 is vulnerable to session fixation because session expiry and randomization are mishandled. The application can reuse a session via PHPSESSID. Also, an attacker can exploit this vulnerability in conjunction with CVE-2020-12256 or CVE-2020-12259.
How severe is CVE-2020-12258?: CVE-2020-12258 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.
Is CVE-2020-12258 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (75th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-12258?: CVE-2020-12258 affects Rconfig. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-12258?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2020-12258 published?: CVE-2020-12258 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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