CVE-2023-5770

5.4 mediumEPSS 0.3%

Medium (5.4) in proofpoint enterprise protection. EPSS 0.3% chance of exploitation in the next 30 days.

Proofpoint Enterprise Protection contains a vulnerability in the email delivery agent that allows an unauthenticated attacker to inject improperly encoded HTML into the email body of a message through the email subject. The vulnerability is caused by inappropriate encoding when rewriting the email before delivery.This issue affects Proofpoint Enterprise Protection: from 8.20.2 before patch 4809, from 8.20.0 before patch 4805, from 8.18.6 before patch 4804 and all other prior versions.

Severity

CVSS 3.1

5.4 medium

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

EPSS: 0.3% chance of exploitation in the next 30 days; higher than 27% of CVEs (scores of 2026-10-31)
CWE: CWE-838
Published: 2024-01-09
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

proofpoint:enterprise_protection

References

https://www.proofpoint.com/us/security/security-advisories/pfpt-sa-2023-0009
https://www.proofpoint.com/us/security/security-advisories/pfpt-sa-2023-0009

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