9.8

CVE-2020-36326: phpmailer_project phpmailer Deserialization of Untrusted Data

CVSS: 9.8v3.1CriticalModified
AliasesUBUNTU-CVE-2020-36326DEBIAN-CVE-2020-36326
Published 28-04-2021Last modified 04-08-2024
Open JSON

Vulnerability summary

CVE-2020-36326 is a critical (CVSS 9.8) Deserialization of Untrusted Data vulnerability in phpmailer_project phpmailer. EPSS estimates a 3.09% chance of exploitation in the next 30 days, higher than 87.5% of scored vulnerabilities.

Overall risk
70/100
0100
High · default modelHow is this calculated?
CVSS score
9.8/10
010
Critical · v3.1 (NVD)
EPSS score
3.09%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 28-04-2021
    PublishedVulnerability first disclosed.
  2. 04-08-2024
    Last modifiedVulnerability information updated.

Description

PHPMailer 6.1.8 through 6.4.0 allows object injection through Phar Deserialization via addAttachment with a UNC pathname. NOTE: this is similar to CVE-2018-19296, but arose because 6.1.8 fixed a functionality problem in which UNC pathnames were always considered unreadable by PHPMailer, even in safe contexts. As an unintended side effect, this fix eliminated the code that blocked addAttachment exploitation.

CVSS metrics

4 scores · 3 sources · 2 versions

EPSS trend

Probability

3.09%

Chance of exploitation in the next 30 days

Percentile

88%

Versus all other CVEs

30-day change

0.00 pp

From 3.09% on 19-09-2026

19-09-202619-10-2026
EPSS score
3.09%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Debian1 product
  • libphp-phpmailer< 6.2.0-2
Phpmailer_project1 product
Ubuntu1 product
  • libphp-phpmailer< 6.2.0-2
Wordpress1 product
  • wordpress≥ 3.7, < 3.7.36 | ≥ 3.8, < 3.8.36 | ≥ 3.9, < 3.9.34 | ≥ 4.0, < 4.0.33 | ≥ 4.1, < 4.1.33 | ≥ 4.2, < 4.2.30 | ≥ 4.3, < 4.3.26 | ≥ 4.4, < 4.4.25 | ≥ 4.5, < 4.5.24 | ≥ 4.6, < 4.6.21 | ≥ 4.7, < 4.7.21 | ≥ 4.8, < 4.8.17 | ≥ 4.9, < 4.9.18 | ≥ 5.0, < 5.0.13 | ≥ 5.1, < 5.1.10 | ≥ 5.2, < 5.2.11 | ≥ 5.3, < 5.3.8 | ≥ 5.4, < 5.4.6 | ≥ 5.5, < 5.5.5 | ≥ 5.6, < 5.6.4 | ≥ 5.7, < 5.7.2

4 vendors · 4 products

References

6 links