Description
An issue was discovered in the base64d function in the SMTP listener in Exim before 4.90.1. By sending a handcrafted message, a buffer overflow may happen. This can be used to execute code remotely.
Metrics
CVSS 3.1 9.8/10
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HWeakness enumeration
Affected software
| Vendor | Product | Versions |
|---|---|---|
| n/a | n/a | n/a |
References
- http://openwall.com/lists/oss-security/2018/02/10/2Mailing List, Third Party Advisory
- http://packetstormsecurity.com/files/162959/Exim-base64d-Buffer-Overflow.htmlExploit, Third Party Advisory, VDB Entry
- http://www.openwall.com/lists/oss-security/2018/02/07/2Mailing List, Third Party Advisory
- http://www.securityfocus.com/bid/103049Broken Link, Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1040461Broken Link, Third Party Advisory, VDB Entry
- https://devco.re/blog/2018/03/06/exim-off-by-one-RCE-exploiting-CVE-2018-6789-en/Exploit, Third Party Advisory
- https://exim.org/static/doc/security/CVE-2018-6789.txtVendor Advisory
- https://git.exim.org/exim.git/commit/cf3cd306062a08969c41a1cdd32c6855f1abecf1Patch
- https://lists.debian.org/debian-lts-announce/2018/02/msg00009.htmlMailing List, Third Party Advisory
- https://usn.ubuntu.com/3565-1/Third Party Advisory
- https://www.debian.org/security/2018/dsa-4110Mailing List, Third Party Advisory
- https://www.exploit-db.com/exploits/44571/Exploit, Third Party Advisory, VDB Entry
- https://www.exploit-db.com/exploits/45671/Exploit, Third Party Advisory, VDB Entry
- http://openwall.com/lists/oss-security/2018/02/10/2Mailing List, Third Party Advisory
- http://packetstormsecurity.com/files/162959/Exim-base64d-Buffer-Overflow.htmlExploit, Third Party Advisory, VDB Entry
- http://www.openwall.com/lists/oss-security/2018/02/07/2Mailing List, Third Party Advisory
- http://www.securityfocus.com/bid/103049Broken Link, Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1040461Broken Link, Third Party Advisory, VDB Entry
- https://devco.re/blog/2018/03/06/exim-off-by-one-RCE-exploiting-CVE-2018-6789-en/Exploit, Third Party Advisory
- https://exim.org/static/doc/security/CVE-2018-6789.txtVendor Advisory
- https://git.exim.org/exim.git/commit/cf3cd306062a08969c41a1cdd32c6855f1abecf1Patch
- https://lists.debian.org/debian-lts-announce/2018/02/msg00009.htmlMailing List, Third Party Advisory
- https://usn.ubuntu.com/3565-1/Third Party Advisory
- https://www.debian.org/security/2018/dsa-4110Mailing List, Third Party Advisory
- https://www.exploit-db.com/exploits/44571/Exploit, Third Party Advisory, VDB Entry
- https://www.exploit-db.com/exploits/45671/Exploit, Third Party Advisory, VDB Entry
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2018-6789US Government Resource
Timeline
- Published
- Feb 8, 2018
- Last modified
- Jun 17, 2026
- Added to CISA KEV
- Nov 3, 2021
- NVD status
- Analyzed