CVE-2010-1192: libESMTP, probably 1.0.4 and earlier, does not properly handle a '\0' character in a domain name in the subjec

Q: How do I fix CVE-2010-1192?

libesmtp: upgrade to newer than 1.0.4. Exact commands for each OS are on this page.

Q: Is CVE-2010-1192 being exploited?

CVE-2010-1192 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2010-1192 affect?

CVE-2010-1192 affects libesmtp. Severity is medium (CVSS 6.8). libESMTP, probably 1.0.4 and earlier, does not properly handle a '\0' character in a domain name in the subject's Common Name (CN) field of an X.509 certificate, which allows man-in-the-middle attackers to spoof arbitrary SSL servers via a

Q: How urgent is CVE-2010-1192?

Priority 44/100. On your watchlist

This month

MEDIUM 6.8WATCHLISTUPGRADE

CVE-2010-1192 is a medium-severity flaw (CVSS 6.8) affecting libesmtp. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

libESMTP, probably 1.0.4 and earlier, does not properly handle a '\0' character in a domain name in the subject's Common Name (CN) field of an X.509 certificate, which allows man-in-the-middle attackers to spoof arbitrary SSL servers via a crafted certificate issued by a legitimate Certification Authority, a related issue to CVE-2009-2408.

Why this priority

On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	6.8 (Medium)
EPSS exploit chance	1.0% (top 37%)
CISA exploited list	No
Weakness	CWE-310
Published	2010-03-31
Last modified	2026-06-16

Publisher (CNA): Canonical Ltd. · Vendor: stafford.uklinux

Last updated 2026-06-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2010-03-31 18:00 UTCPublished CVE record published
2026-06-16 23:17 UTCUpdated Record last modified

stafford.uklinux libesmtp UPGRADE

Affected: <= 1.0.4 · 0.1 · 0.1 a · 0.2 · 0.3 · 0.4 · 0.5 · 0.6

Fixed in: newer than 1.0.4

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy libesmtp || rpm -q libesmtp || libesmtp --version

2. UPGRADE to newer than 1.0.4 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade libesmtp

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade libesmtp

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2010-1192?

libesmtp: upgrade to newer than 1.0.4. Exact commands for each OS are on this page.

Is CVE-2010-1192 being exploited?

CVE-2010-1192 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2010-1192 affect?

CVE-2010-1192 affects libesmtp. Severity is medium (CVSS 6.8). libESMTP, probably 1.0.4 and earlier, does not properly handle a '\0' character in a domain name in the subject's Common Name (CN) field of an X.509 certificate, which allows man-in-the-middle attackers to spoof arbitrary SSL servers via a

How urgent is CVE-2010-1192?

Priority 44/100. On your watchlist

Related CVEs

CVE-2019-19977 CRITICAL 9.8 UPGRADE libESMTP through 1.0.6 mishandles domain copying into a fixed-size buffer in ntlm_build_type_2 in ntlm/ntlmstr
CVE-2010-1194 MEDIUM 6.8 DOWNGRADE The match_component function in smtp-tls.c in libESMTP 1.0.3.r1, and possibly other versions including 1.0.4,
CVE-2002-1090 HIGH 7.5 UPGRADE Buffer overflow in read_smtp_response of protocol.c in libesmtp before 0.8.11 allows a remote SMTP server to (

References

← Back to latest CVEs