How severe is CVE-2020-14933?

CVE-2020-14933 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2020-14933 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (70th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-14933?

CVE-2020-14933 affects Squirrelmail. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-14933?

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-2020-14933 published?

CVE-2020-14933 was published on 2020-06-20 and last updated on 2026-06-17.

CVE-2020-14933

CVE-2020-14933 is a high-severity vulnerability in Squirrelmail with a CVSS 3.x base score of 8.8. 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-502.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v2: 6.5
EPSS exploit prediction: 1% (70th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-502
Affected product: Squirrelmail
Published: 2020-06-20
Last modified: 2026-06-17

Description

compose.php in SquirrelMail 1.4.22 calls unserialize for the $attachments value, which originates from an HTTP POST request. NOTE: the vendor disputes this because these two conditions for PHP object injection are not satisfied: existence of a PHP magic method (such as __wakeup or __destruct), and any attack-relevant classes must be declared before unserialize is called (or must be autoloaded).

Frequently asked questions

What is CVE-2020-14933?: compose.php in SquirrelMail 1.4.22 calls unserialize for the $attachments value, which originates from an HTTP POST request. NOTE: the vendor disputes this because these two conditions for PHP object injection are not satisfied: existence of a PHP magic method (such as __wakeup or __destruct), and any attack-relevant classes must be declared before unserialize is called (or must be autoloaded).
How severe is CVE-2020-14933?: CVE-2020-14933 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2020-14933 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (70th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-14933?: CVE-2020-14933 affects Squirrelmail. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-14933?: 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-2020-14933 published?: CVE-2020-14933 was published on 2020-06-20 and last updated on 2026-06-17.

References

https://www.openwall.com/lists/oss-security/2020/06/20/1

Affected products (1)

cpe:2.3:a:squirrelmail:squirrelmail:1.4.22:*:*:*:*:*:*:*

More vulnerabilities in Squirrelmail

CVE-2004-0521 — Critical (CVSS 10.0): SQL injection vulnerability in SquirrelMail before 1.4.3 RC1 allows remote attackers to execute unauthorized SQL…
CVE-2002-0516 — Critical (CVSS 10.0): SquirrelMail 1.2.5 and earlier allows authenticated SquirrelMail users to execute arbitrary commands by modifying the…
CVE-2020-14932 — Critical (CVSS 9.8): compose.php in SquirrelMail 1.4.22 calls unserialize for the $mailtodata value, which originates from an HTTP GET…
CVE-2018-8741 — High (CVSS 8.8): A directory traversal flaw in SquirrelMail 1.4.22 allows an authenticated attacker to exfiltrate (or potentially…
CVE-2017-7692 — High (CVSS 8.8): SquirrelMail 1.4.22 (and other versions before 20170427_0200-SVN) allows post-authentication remote code execution via…
CVE-2007-3636 — High (CVSS 7.5): Multiple unspecified vulnerabilities in the G/PGP (GPG) Plugin 2.1 for Squirrelmail allow remote attackers to execute…

All CVEs affecting Squirrelmail →

Other CWE-502 (Deserialization of Untrusted Data) vulnerabilities

CVE-2026-41104 — Critical (CVSS 10.0): Deserialization of untrusted data in Microsoft Planetary Computer Pro allows an unauthorized attacker to disclose…
CVE-2026-43633 — Critical (CVSS 10.0): HestiaCP versions 1.9.0 through 1.9.4 contain a deserialization vulnerability in the web terminal component caused by a…
CVE-2026-33819 — Critical (CVSS 10.0): Deserialization of untrusted data in Microsoft Bing allows an unauthorized attacker to execute code over a network.
CVE-2026-20131 — Critical (CVSS 10.0): A vulnerability in the web-based management interface of Cisco Secure Firewall Management Center (FMC) Software could…
CVE-2026-25632 — Critical (CVSS 10.0): EPyT-Flow is a Python package designed for the easy generation of hydraulic and water quality scenario data of water…
CVE-2025-14931 — Critical (CVSS 10.0): Hugging Face smolagents Remote Python Executor Deserialization of Untrusted Data Remote Code Execution Vulnerability.…

Browse all CWE-502 (Deserialization of Untrusted Data) vulnerabilities →