How severe is CVE-2020-18305?

CVE-2020-18305 has a CVSS 3.x base score of 8.0, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2020-18305 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (49th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-18305?

CVE-2020-18305 primarily affects Extremenetworks Extremexos. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2020-18305?

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.

Does CVE-2020-18305 have an EU (EUVD) identifier?

Yes. CVE-2020-18305 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2020-10232.

When was CVE-2020-18305 published?

CVE-2020-18305 was published on 2024-05-14 and last updated on 2026-06-17.

CVE-2020-18305

CVE-2020-18305 is a high-severity vulnerability in Extremenetworks Extremexos with a CVSS 3.x base score of 8.0. 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-287.

Key facts

Severity: High (CVSS 3.x base score 8.0)
EPSS exploit prediction: 1% (49th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2020-10232
Weakness: CWE-287
Affected product: Extremenetworks Extremexos
Published: 2024-05-14
Last modified: 2026-06-17

Description

Extreme Networks EXOS before v.22.7 and before v.30.2 was discovered to contain an issue in its Web GUI which fails to restrict URL access, allowing attackers to access sensitive information or escalate privileges.

Frequently asked questions

What is CVE-2020-18305?: Extreme Networks EXOS before v.22.7 and before v.30.2 was discovered to contain an issue in its Web GUI which fails to restrict URL access, allowing attackers to access sensitive information or escalate privileges.
How severe is CVE-2020-18305?: CVE-2020-18305 has a CVSS 3.x base score of 8.0, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2020-18305 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (49th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-18305?: CVE-2020-18305 primarily affects Extremenetworks Extremexos. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2020-18305?: 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.
Does CVE-2020-18305 have an EU (EUVD) identifier?: Yes. CVE-2020-18305 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2020-10232.
When was CVE-2020-18305 published?: CVE-2020-18305 was published on 2024-05-14 and last updated on 2026-06-17.

References

https://gist.github.com/yasinyilmaz/1fe3fe58dd275edb77dcbe890fce2f2c

Affected products (2)

cpe:2.3:o:extremenetworks:extremexos:*:*:*:*:*:*:*:*
cpe:2.3:o:extremenetworks:extremexos:30.1:*:*:*:*:*:*:*

More vulnerabilities in Extremenetworks Extremexos

CVE-2024-27453 — High (CVSS 8.6): In Extreme XOS through 22.6.1.4, a read-only user can escalate privileges to root via a crafted HTTP POST request to…
CVE-2017-14332 — High (CVSS 8.1): Extreme EXOS 15.7, 16.x, 21.x, and 22.x allows remote attackers to hijack sessions by determining SessionID values.
CVE-2017-14328 — High (CVSS 7.5): Extreme EXOS 15.7, 16.x, 21.x, and 22.x allows remote attackers to trigger a buffer overflow leading to a reboot.
CVE-2017-14331 — Medium (CVSS 6.7): Extreme EXOS 16.x, 21.x, and 22.x allows administrators to bypass the "exsh restricted shell" protection mechanism and…
CVE-2017-14330 — Medium (CVSS 6.7): Extreme EXOS 16.x, 21.x, and 22.x allows administrators to obtain a root shell via vectors involving a privileged…
CVE-2017-14329 — Medium (CVSS 6.7): Extreme EXOS 16.x, 21.x, and 22.x allows administrators to obtain a root shell via vectors involving an exsh debug…

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Other CWE-287 (Improper Authentication) vulnerabilities

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CVE-2026-10611 — Critical (CVSS 10.0): An authentication bypass vulnerability exists in MISP when LDAP mixed authentication is enabled with OTP enforcement.…
CVE-2026-47280 — Critical (CVSS 10.0): Improper authentication in Azure Resource Manager (ARM) allows an unauthorized attacker to elevate privileges over a…
CVE-2026-42822 — Critical (CVSS 10.0): Improper authentication in Azure Local Disconnected Operations allows an unauthorized attacker to elevate privileges…
CVE-2026-20182 — Critical (CVSS 10.0): May 2026: This security advisory provides the details and fix information for a vulnerability that was discovered and…

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