CVE-2020-28247

mediumpriority · track · 22EPSS 0.015 · 75 %ileEUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

1.52% (75th) EPSS

CVSS 5 · medium

Is it mine?

9 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · osv · nvd

EPSS · scored 2026-10-28

The lettre library through 0.10.0-alpha for Rust allows arbitrary sendmail option injection via transport/sendmail/mod.rs.

cvss

Technical severity, 0–10. One row per scoring source.

5.3

010

base score 0–10 · higher = more severe · hover a vector to decode

v2.05mediumAV:N/AC:L/Au:N/C:N/I:P/A:Nprimary · NVD / NIST USexploitability 10 · impact 2.9

v3.15.3mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:Nprimary · NVD / NIST USexploitability 3.9 · impact 1.4

v3.15.3mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:Nsecondary · OSV

v3.14.9mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N/E:Usecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-77US

affected products (9)

Products and version ranges known to be affected.

n/a n/a≤ n/aenisa_euvdEU
lettre lettre= 0.10.0nvdUScpe:2.3:a:lettre:lettre:*:*:*:*:*:*:*:*
lettre lettre= 0.7.0nvdUScpe:2.3:a:lettre:lettre:*:*:*:*:*:*:*:*
lettre lettre0.8.0 → 0.8.3nvdUScpe:2.3:a:lettre:lettre:*:*:*:*:*:*:*:*
lettre lettre0.9.0 → 0.9.5nvdUScpe:2.3:a:lettre:lettre:*:*:*:*:*:*:*:*
crates.io lettre0.10.0-alpha.1 → 0.10.0-alpha.4osvUSpkg:cargo/lettre
crates.io lettre0.7.0 → 0.7.1osvUSpkg:cargo/lettre
crates.io lettre0.8.0 → 0.8.4osvUSpkg:cargo/lettre
crates.io lettre0.9.0 → 0.9.5osvUSpkg:cargo/lettre

advisories (2)

Vendor and ecosystem advisories describing this.

GHSA-vc2p-r46x-m3vxArgument injection in lettre2021-08-25ghsa · osvUS
### Impact Affected versions of lettre allowed argument injection to the sendmail command. It was possible, using forged to addresses, to pass arbitrary arguments to the sendmail executable. Depending on the implementation (original sendmail, postfix, exim, etc.) it could be possible in some cases to write email data into abritrary files (using sendmail's logging features). *NOTE*: This vulnerability only affects the sendmail transport. Others, including smtp, are not affected. ### Fix The flaw is corrected by modifying the executed command to stop parsing arguments before passing the destination addresses. ### References * [RUSTSEC-2020-0069](https://rustsec.org/advisories/RUSTSEC-2020-0069.html) * [CVE-2020-28247](https://nvd.nist.gov/vuln/detail/CVE-2020-28247)
RUSTSEC-2020-0069Argument injection in sendmail transport2020-11-11vendor · osvUS
Affected versions of lettre allowed argument injection to the sendmail command. It was possible, using forged `to` addresses, to pass arbitrary arguments to the sendmail executable. Depending on the implementation (original sendmail, postfix, exim, etc.) it could be possible in some cases to write email data into arbitrary files (using sendmail's logging features). The flaw is corrected by modifying the executed command to stop parsing arguments before passing the destination addresses. NOTE: This vulnerability only affects the `sendmail` transport. Others, including `smtp`, are not affected. This vulnerability was reported by vin01.

also known as (5)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd osv nvd NVD CVE.org MITRE

published 2020-11-12modified 2026-06-17

references (10)

External citations — patches, advisories, analysis.

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