CVE-2010-4344 KEV EXPLOIT
9.8
CRITICAL · CVSS 3.1 · EPSS 71.7% (pctl 99)
Patch first
On CISA KEV — known exploited in the wild, due 2022-04-15.
Description
Heap-based buffer overflow in the string_vformat function in string.c in Exim before 4.70 allows remote attackers to execute arbitrary code via an SMTP session that includes two MAIL commands in conjunction with a large message containing crafted headers, leading to improper rejection logging.
Scoring
| CVSS | 9.8 (CRITICAL, v3.1) |
|---|---|
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| EPSS | 71.71% — more likely to be exploited than 99% of all CVEs |
| Weakness | CWE-787 |
| On CISA KEV | yes — remediate by 2022-04-15 |
| Public exploit | yes |
| Published | 2010-12-14 |
| Last modified | 2026-06-16 |
CISA KEV
| Name | Exim Heap-Based Buffer Overflow Vulnerability |
|---|---|
| Added | 2022-03-25 |
| Due | 2022-04-15 |
| Vendor / product | Exim / Exim |
| Ransomware use | none reported |
Affected (4)
| Vendor | Product |
|---|---|
| canonical | ubuntu linux |
| debian | debian linux |
| exim | exim |
| opensuse | opensuse |
Public exploits
| Source | Title | Date |
|---|---|---|
| exploit-db | Exim4 < 4.69 - string_format Function Heap Buffer Overflow (Metasploit) | 2010-12-16 |
| exploit-db | Exim 4.63 - Remote Command Execution | 2010-12-11 |
References
- ftp://ftp.exim.org/pub/exim/ChangeLogs/ChangeLog-4.70
- http://atmail.com/blog/2010/atmail-6204-now-available/
- http://bugs.exim.org/show_bug.cgi?id=787
- http://git.exim.org/exim.git/commit/24c929a27415c7cfc7126c47e4cad39acf3efa6b
- http://lists.exim.org/lurker/message/20101210.164935.385e04d0.en.html
- http://lists.opensuse.org/opensuse-security-announce/2010-12/msg00003.html
- http://openwall.com/lists/oss-security/2010/12/10/1
- http://secunia.com/advisories/40019
- http://secunia.com/advisories/42576
- http://secunia.com/advisories/42586
- http://secunia.com/advisories/42587
- http://secunia.com/advisories/42589
- http://www.cpanel.net/2010/12/exim-remote-memory-corruption-vulnerability-notification-cve-2010-4344.html
- http://www.debian.org/security/2010/dsa-2131
- http://www.exim.org/lurker/message/20101207.215955.bb32d4f2.en.html
- http://www.kb.cert.org/vuls/id/682457
- http://www.metasploit.com/modules/exploit/unix/smtp/exim4_string_format
- http://www.openwall.com/lists/oss-security/2021/05/04/7
- http://www.osvdb.org/69685
- http://www.redhat.com/support/errata/RHSA-2010-0970.html
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