Predictive Vulnerability Intelligence.

Product

  • Product
  • Pricing
  • Documentation

Company

  • About
  • Partnerships
  • Blog
  • Support

Legal

  • Terms
  • Privacy
  • Data Licensing

© 2026 FAUCET Technologies LLC. All rights reserved.

CVE-2020-28247

19
FAUCET Score

CVE-2020-28247 describes an arbitrary sendmail option injection vulnerability in the Rust 'lettre' library, specifically affecting versions through 0.10.0-alpha. This medium-severity vulnerability (CVSS 5.3) allows an unauthenticated attacker to achieve low integrity impact with no confidentiality or availability impact, requiring no user interaction. There is no evidence of active exploitation, publicly available exploit code, or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
>= 0.8.0, <= 0.8.3CPE matchmatch criteria
cpe:2.3:a:lettre:lettre:*:*:*:*:*:*:*:*
>= 0.9.0, <= 0.9.5CPE matchmatch criteria
cpe:2.3:a:lettre:lettre:*:*:*:*:*:*:*:*
0.7.0CPE matchmatch criteria
cpe:2.3:a:lettre:lettre:0.7.0:*:*:*:*:*:*:*
0.10.0CPE matchmatch criteria
cpe:2.3:a:lettre:lettre:0.10.0:alpha1:*:*:*:*:*:*
0.10.0CPE matchmatch criteria
cpe:2.3:a:lettre:lettre:0.10.0:alpha2:*:*:*:*:*:*

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
1.50%
Probability of exploitation in next 30 days
EPSS Percentile
71.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0150 is in the 54th percentile among its peer group of 23,701 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

Patch Available

Vendor Patches (4)

github_advisorypatch availablevia nvd_reference
View patch
rustpatch availablevia ghsa
Product: lettreFixed in: 0.9.5
rustpatch availablevia ghsa
Product: lettreFixed in: 0.8.4
rustpatch availablevia ghsa
Product: lettreFixed in: 0.7.1

Vendor Advisories (1)

rustGHSA-vc2p-r46x-m3vxmedium

Argument injection in lettre

Aug 25, 2021

References

github.com / lettre/lettre
ProductThird Party Advisory
github.com / RustSec/advisory-db/pull/478/files
PatchThird Party Advisory
rustsec.org / advisories/RUSTSEC-2020-0069.html
Third Party Advisory