CVE-2020-12063

FAUCET Score

CVE-2020-12063 affects certain Postfix 2.10.1-7 packages, allowing an attacker to spoof sender addresses in emails using homoglyph characters, specifically when the /etc/postfix/sender_login feature is in use. This medium-severity vulnerability (CVSS 5.3) has a low attack complexity and can lead to information integrity issues, as spoofed messages bypass sender authentication checks. There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

Vendor	Product	Version(s)	CPE
		2.10.1CPE matchmatch criteria	cpe:2.3:a:postfix:postfix:2.10.1:::::::*

CVSS Data

CVSS version used by this source: 3.1

5.3MEDIUM

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

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

LOW

Availability Impact

NONE

Exploitability Score

3.9

Impact Score

1.4

CvssVersion

3.1

Exploit Intelligence

EPSS Score

0.94%

Probability of exploitation in next 30 days

EPSS Percentile

57.1%

Percentile rank of EPSS score among Peer Group

As of 2026-07-27

Model: v2026.06.15

This CVE's current EPSS score of 0.0094 is in the 36th percentile among its peer group of 23,705 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Advisories (1)

redhatCVE-2020-12063

postfix: an attacker may send an email from an arbitrary-looking sender via a homoglyph attack

Apr 24, 2020

References

openwall.com / lists/oss-security/2020/04/23/12

ExploitMailing ListThird Party Advisory

openwall.com / lists/oss-security/2020/04/23/3

Mailing ListThird Party Advisory