How severe is CVE-2020-29238?

CVE-2020-29238 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2020-29238 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 17% (97th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-29238?

CVE-2020-29238 affects Expressvpn. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-29238?

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-2020-29238 published?

CVE-2020-29238 was published on 2021-03-10 and last updated on 2026-07-09.

CVE-2020-29238

CVE-2020-29238 is a high-severity vulnerability in Expressvpn with a CVSS 3.x base score of 7.5. Its EPSS exploit-prediction score of 17% places it in the 97th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-190.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 17% (97th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-190
Affected product: Expressvpn
Published: 2021-03-10
Last modified: 2026-07-09

Description

An integer buffer overflow in the Nginx webserver of ExpressVPN Router version 1 allows remote attackers to obtain sensitive information when the server running as reverse proxy via specially crafted request.

Frequently asked questions

What is CVE-2020-29238?: An integer buffer overflow in the Nginx webserver of ExpressVPN Router version 1 allows remote attackers to obtain sensitive information when the server running as reverse proxy via specially crafted request.
How severe is CVE-2020-29238?: CVE-2020-29238 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2020-29238 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 17% (97th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-29238?: CVE-2020-29238 affects Expressvpn. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-29238?: 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-2020-29238 published?: CVE-2020-29238 was published on 2021-03-10 and last updated on 2026-07-09.

References

Affected products (1)

cpe:2.3:a:expressvpn:expressvpn:1.0:*:*:*:*:*:*:*

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