CVE-2020-5616

[Calendar01], [Calendar02], [PKOBO-News01], [PKOBO-vote01], [Telop01], [Gallery01], [CalendarForm01], and [Link01] [Calendar01] free edition ver1.0.0, [Calendar02] free edition ver1.0.0, [PKOBO-News01] free edition ver1.0.3 and earlier, [PKOBO-vote01] free edition ver1.0.1 and earlier, [Telop01] free edition ver1.0.0, [Gallery01] free edition ver1.0.3 and earlier, [CalendarForm01] free edition ver1.0.3 and earlier, and [Link01] free edition ver1.0.0 allows remote attackers to bypass authentication and log in to the product with administrative privileges via unspecified vectors.

Published: 2020-08-03 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2020-5616 is rated High Risk (68.5/100): CVSS Critical severity, with medium exploitation likelihood (EPSS 3.06%). 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-2020-5616

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 2026-06-15 3.86% 3.06% -0.80%
2 2025-03-30 7.56% 3.86% -3.70%
3 2025-03-29 — 7.56% —

Full EPSS history (16 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2020-5616

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
9.8 3.1 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H 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:N)
No account or special rights needed—anonymous or random user is enough.
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:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 5.9 [email protected]
7.5 2.0 HIGH
AV:N/AC:L/Au:N/C:P/I:P/A:P 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:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 6.4 [email protected]

Weakness enumeration for CVE-2020-5616

Affected software / configurations for CVE-2020-5616

Vendor Product Version Raw CPE
calendar01_project calendar01 1.0.0 cpe:2.3:a:calendar01_project:calendar01:1.0.0:*:*:*:free:*:*:*
calendar02_project calendar02 1.0.0 cpe:2.3:a:calendar02_project:calendar02:1.0.0:*:*:*:free:*:*:*
calendarform01_project calendarform01 <= 1.0.3 cpe:2.3:a:calendarform01_project:calendarform01:*:*:*:*:free:*:*:*
gallery01_project gallery01 <= 1.0.3 cpe:2.3:a:gallery01_project:gallery01:*:*:*:*:free:*:*:*
link01_project link01 1.0.0 cpe:2.3:a:link01_project:link01:1.0.0:*:*:*:free:*:*:*
pkobo-news01_project pkobo-news01 <= 1.0.3 cpe:2.3:a:pkobo-news01_project:pkobo-news01:*:*:*:*:free:*:*:*
pkobo-vote01_project pkobo-vote01 <= 1.0.1 cpe:2.3:a:pkobo-vote01_project:pkobo-vote01:*:*:*:*:free:*:*:*
telop01_project telop01 1.0.0 cpe:2.3:a:telop01_project:telop01:1.0.0:*:*:*:free:*:*:*

References for CVE-2020-5616

URL Tags
https://jvn.jp/en/jp/JVN73169744/index.html Third Party Advisory
https://www.php-factory.net/calendar/01.php Product Third Party Advisory
https://www.php-factory.net/calendar/02.php Product Third Party Advisory
https://www.php-factory.net/calendar_form/01.php Product Third Party Advisory
https://www.php-factory.net/gallery/01.php Product Third Party Advisory
https://www.php-factory.net/link/01.php Product Third Party Advisory
https://www.php-factory.net/news/pkobo-news01.php Product Third Party Advisory
https://www.php-factory.net/telop/01.php Product Third Party Advisory
https://www.php-factory.net/vote/01.php Product Third Party Advisory
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