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Vulnerability · Published Jul 27, 2020 · Assigned by mitre

CVE-2020-15953

High 7.4

In plain English

A high-severity security flaw in the libetpan package (Alpine). There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 2.4% (higher than 84% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS NVD)7.4High
Exploit odds (30 days)2.4%top 15.9% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known

Official description

LibEtPan through 1.9.4, as used in MailCore 2 through 0.6.3 and other products, has a STARTTLS buffering issue that affects IMAP, SMTP, and POP3. When a server sends a "begin TLS" response, the client reads additional data (e.g., from a meddler-in-the-middle attacker) and evaluates it in a TLS context, aka "response injection."

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Alpine:v3.20libetpan1.9.4-r1ALPINE-CVE-2020-15953
Alpine:v3.21libetpan1.9.4-r1ALPINE-CVE-2020-15953
Alpine:v3.22libetpan1.9.4-r1ALPINE-CVE-2020-15953
Alpine:v3.23libetpan1.9.4-r1ALPINE-CVE-2020-15953
Alpine:v3.24libetpan1.9.4-r1ALPINE-CVE-2020-15953
Debian:12libetpan1.9.4-3DEBIAN-CVE-2020-15953
Debian:13libetpan1.9.4-3DEBIAN-CVE-2020-15953
Debian:14libetpan1.9.4-3DEBIAN-CVE-2020-15953
Ubuntu:22.04:LTSlibetpanno fix listedUBUNTU-CVE-2020-15953
Ubuntu:24.04:LTSlibetpanno fix listedUBUNTU-CVE-2020-15953
Ubuntu:25.10libetpanno fix listedUBUNTU-CVE-2020-15953
Ubuntu:26.04:LTSlibetpanno fix listedUBUNTU-CVE-2020-15953
Ubuntu:26.10libetpanno fix listedUBUNTU-CVE-2020-15953

Affected products (as reported)

VendorProductVersions
n/a n/a n/a

References