How severe is CVE-2021-43690?

CVE-2021-43690 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2021-43690 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (45th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-43690?

CVE-2021-43690 affects Yurunproxy Project Yurunproxy. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-43690?

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

When was CVE-2021-43690 published?

CVE-2021-43690 was published on 2021-12-01 and last updated on 2026-06-17.

CVE-2021-43690

CVE-2021-43690 is a medium-severity vulnerability in Yurunproxy Project Yurunproxy with a CVSS 3.x base score of 6.1. 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-79.

Key facts

Severity: Medium (CVSS 3.x base score 6.1)
CVSS v2: 4.3
EPSS exploit prediction: 1% (45th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Yurunproxy Project Yurunproxy
Published: 2021-12-01
Last modified: 2026-06-17

Description

YurunProxy v0.01 is affected by a Cross Site Scripting (XSS) vulnerability in src/Client.php. The exit function will terminate the script and print a message which have values from the socket_read.

Frequently asked questions

What is CVE-2021-43690?: YurunProxy v0.01 is affected by a Cross Site Scripting (XSS) vulnerability in src/Client.php. The exit function will terminate the script and print a message which have values from the socket_read.
How severe is CVE-2021-43690?: CVE-2021-43690 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2021-43690 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (45th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-43690?: CVE-2021-43690 affects Yurunproxy Project Yurunproxy. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-43690?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-43690 published?: CVE-2021-43690 was published on 2021-12-01 and last updated on 2026-06-17.

References

https://github.com/Yurunsoft/YurunProxy/issues/3

Affected products (1)

cpe:2.3:a:yurunproxy_project:yurunproxy:0.01:*:*:*:*:*:*:*

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