CVE-2020-8255

A vulnerability in the Pulse Connect Secure < 9.1R9 admin web interface could allow an authenticated attacker to perform an arbitrary file reading vulnerability is fixed using encrypted URL blacklisting that prevents these messages.

Published: 2020-10-28 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2020-8255 is rated Moderate Risk (57.5/100): CVSS Medium severity, with high exploitation likelihood (EPSS 13.49%, 94th percentile). EPSS ranks this CVE among the most likely to be exploited in the near term. EPSS rose +5.09% over the last day, indicating growing attacker interest. High exploitation likelihood—assess exposure and prioritize remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2020-8255

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-03-04 8.40% 13.49% +5.09%
2 2026-03-01 13.49% 8.40% -5.09%
3 2026-02-04 — 13.49% —

Full EPSS history (42 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2020-8255

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
4.9 3.1 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:H)
They need powerful rights—admin, root, or similar—before this pays off.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:N)
Service keeps running; no real outage angle.
 1.2 3.6 [email protected]
4.0 2.0 MEDIUM
AV:N/AC:L/Au:S/C:P/I:N/A:N Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:S)
A single authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:N)
No availability impact.
 8.0 2.9 [email protected]

Weakness enumeration for CVE-2020-8255

Affected software / configurations for CVE-2020-8255

Vendor Product Version Raw CPE
pulsesecure pulse_secure_desktop_client < 9.1 cpe:2.3:a:pulsesecure:pulse_secure_desktop_client:*:*:*:*:*:linux:*:*
pulsesecure pulse_secure_desktop_client 9.1 cpe:2.3:a:pulsesecure:pulse_secure_desktop_client:9.1:-:*:*:*:linux:*:*
pulsesecure pulse_secure_desktop_client 9.1 cpe:2.3:a:pulsesecure:pulse_secure_desktop_client:9.1:r1:*:*:*:linux:*:*
pulsesecure pulse_secure_desktop_client 9.1 cpe:2.3:a:pulsesecure:pulse_secure_desktop_client:9.1:r2:*:*:*:linux:*:*
pulsesecure pulse_secure_desktop_client 9.1 cpe:2.3:a:pulsesecure:pulse_secure_desktop_client:9.1:r3:*:*:*:linux:*:*
pulsesecure pulse_secure_desktop_client 9.1 cpe:2.3:a:pulsesecure:pulse_secure_desktop_client:9.1:r3.1:*:*:*:linux:*:*
pulsesecure pulse_secure_desktop_client 9.1 cpe:2.3:a:pulsesecure:pulse_secure_desktop_client:9.1:r4:*:*:*:linux:*:*
pulsesecure pulse_secure_desktop_client 9.1 cpe:2.3:a:pulsesecure:pulse_secure_desktop_client:9.1:r4.1:*:*:*:linux:*:*
pulsesecure pulse_secure_desktop_client 9.1 cpe:2.3:a:pulsesecure:pulse_secure_desktop_client:9.1:r4.2:*:*:*:linux:*:*
pulsesecure pulse_secure_desktop_client 9.1 cpe:2.3:a:pulsesecure:pulse_secure_desktop_client:9.1:r5:*:*:*:linux:*:*
pulsesecure pulse_secure_desktop_client 9.1 cpe:2.3:a:pulsesecure:pulse_secure_desktop_client:9.1:r6:*:*:*:linux:*:*
pulsesecure pulse_secure_desktop_client 9.1 cpe:2.3:a:pulsesecure:pulse_secure_desktop_client:9.1:r7:*:*:*:linux:*:*
pulsesecure pulse_secure_desktop_client 9.1 cpe:2.3:a:pulsesecure:pulse_secure_desktop_client:9.1:r7.1:*:*:*:linux:*:*
pulsesecure pulse_secure_desktop_client 9.1 cpe:2.3:a:pulsesecure:pulse_secure_desktop_client:9.1:r8:*:*:*:linux:*:*
pulsesecure pulse_secure_desktop_client 9.1 cpe:2.3:a:pulsesecure:pulse_secure_desktop_client:9.1:r8.2:*:*:*:linux:*:*

References for CVE-2020-8255

cvelogic Threat Intelligence