U/OO/140757-20 PP-20-0393 28 May 2020
…can also be queried for emails with a recipient containing “${run”, which would likely indicate a CVE -2019-10149 exploit…
5 passages name itOriginal (opens in a new tab) ↗
CVE-2019-10149 KEVPublic exploit Critical · 9.8 EPSS >99.9%
Exim Mail Transfer Agent (MTA) Improper Input Validation
Exim · Mail Transfer Agent (MTA)
Summary
The flaw is an improper validation of the recipient address in the deliver_message() function in /src/deliver.c of the Exim Mail Transfer Agent (MTA), affecting Exim versions 4.87 through 4.91 inclusive. An attacker who can reach the mail server over the network can send a crafted recipient address that may lead to remote command execution, with no authentication or user interaction required.
Official description · NVD
A flaw was found in Exim versions 4.87 to 4.91 (inclusive). Improper validation of recipient address in deliver_message() function in /src/deliver.c may lead to remote command execution.
Priority scorePatchfirst’s 0 to 100 ranking. It adds points for CISA KEV listing, ransomware use, EPSS, threat reports, public exploit code and CVSS. Every CVE page shows the breakdown. Breakdown
77.6 / 100
- Exploited
- Yes, in CISA KEV
- Reports
- 3
- Tactics
- 2/15
How an attack unfolds
Based on MITRE ATT&CKA public catalogue of the techniques attackers use, maintained by MITRE. Patchfirst uses it to describe what attackers do with a vulnerability. mappings. Select a step to see the evidence.Exploitation timelineDated milestones for a CVE: when it was disclosed, when exploit code became public, when exploitation was confirmed, and when threat reports named it.
First seen exploited 7 months after disclosure. Public exploit code (Exploit-DB) was available the same day.
- First seen exploitedVulnCheck KEV evidence+7 mo
- Added to CISA KEVEU database agrees+3 yrs
CISA KEV listing is when exploitation was confirmed, not necessarily the first attack.
MITRE ATT&CKA public catalogue of the techniques attackers use, maintained by MITRE. Patchfirst uses it to describe what attackers do with a vulnerability. techniques
2 TechniqueOne specific attacker behaviour in MITRE ATT&CK, such as T1190 “Exploit Public-Facing Application”. IDs with a dot, like T1059.004, are sub-techniques., grouped by TacticThe attacker’s goal at a stage of an attack in MITRE ATT&CK, such as Initial Access or Persistence. Each technique belongs to one or more tactics. in kill-chain order, 2 cited passages 11Initial AccessTA0001
Exploit Public-Facing Application T1190 Medium Confidence (technique links)How sure Patchfirst is that an ATT&CK technique applies to this CVE. High and medium links are shown by default; low ones come from early or generic mappings, text matching, or contradict the CVE’s details.
MITRE CTID mapping of the CVE · uncategorised
ExecutionTA0002
Command and Scripting Interpreter T1059 Medium Confidence (technique links)How sure Patchfirst is that an ATT&CK technique applies to this CVE. High and medium links are shown by default; low ones come from early or generic mappings, text matching, or contradict the CVE’s details.
AI mapping from the description · primary impact
Successful exploit yields command execution on host
may lead to remote command execution
Lower-confidence links (1)
These come from early or generic mappings, text matching, or contradict this CVE’s details (for example a public-facing technique on a bug that needs a user to open a file). Shown for completeness.
- Exploitation for Client ExecutionT1203 server-side bug exploitable without user interaction; client-execution technique does not fit
Detection
0 rules for this CVE · 244 general rules for its techniquesRules for this CVE
0Sigma ruleAn open, vendor-neutral detection rule for log data. Security teams convert Sigma rules into searches for their own SIEM. that reference CVE-2019-10149 directly.CVE-specific rules are not available in this build. Search SigmaHQ ↗
General rules for this CVE’s techniques
These detect the technique in general, not this specific vulnerability.
Command and Scripting InterpreterT105995 general rules
- HackTool - Sliver C2 Implant Activity Patterncriticaltest
- Lazarus Group Activitycriticaltest
- REvil Kaseya Incident Malware Patternscriticaltest
- Turla Group Lateral Movementcriticaltest
- Windows Defender AMSI Trigger Detectedhighstable
- Windows Defender Threat Detectedhighstable
- Abusable DLL Potential Sideloading From Suspicious Locationhightest
- Add Insecure Download Source To Wingethightest
Exploit Public-Facing ApplicationT1190149 general rules
- Arcadyan Router Exploitationscriticaltest
- Citrix ADS Exploitation CVE-2020-8193 CVE-2020-8195criticaltest
- Citrix Netscaler Attack CVE-2019-19781criticaltest
- Confluence Exploitation CVE-2019-3398criticaltest
- CVE-2010-5278 Exploitation Attemptcriticaltest
- CVE-2020-0688 Exchange Exploitation via Web Logcriticaltest
- CVE-2020-10148 SolarWinds Orion API Auth Bypasscriticaltest
- CVE-2020-5902 F5 BIG-IP Exploitation Attemptcriticaltest
Sigma rules © SigmaHQ, Detection Rule License 1.1; linked, not reproduced.
What security researchers reported
Named in 3 threat reports3 reportsmedia.defense.govservices.google.comdomaintools.com
Reports are matched by finding the exact id CVE-2019-10149 in their text; nobody has reviewed the match. One passage is shown per report, at most 320 characters, linked to the original.
APT44: Unearthing
#1 A102-579 Malicious File Transfer - APT44, VPNFILTER, Download, Variant #1 A102-580 Malicious File Transfer - APT44, VPNFILTER, Download, Variant #2 A102-581 Malicious File Transfer - APT44, VPNFILTER, Download, Variant #3 A101-287 Malicious File Transfer - CVE-2019-10149, APT44, Malicious Bash Script,…
3 passages name itOriginal (opens in a new tab) ↗
Centreon to Exim and Back: On the Trail of Sandworm
The vulnerability linked to Sandworm activity, CVE-2019-10149, can allow for Remote Code Execution (RCE) on the vulnerable host depending on Exim’s configuration and if it is remotely accessible.
Also mentioned in 50 community threat pulses (AlienVault OTX)
Weaker evidencePulses are indicator collections that anyone can publish. A mention is not confirmation of exploitation.
- Actively_Exploited_Kev | Oct 29, 202628 Oct 2026
- Actively_Exploited_Kev | Oct 28, 202627 Oct 2026
- Actively_Exploited_Kev | Oct 27, 202626 Oct 2026
- Actively_Exploited_Kev | Oct 24, 202623 Oct 2026
- Actively_Exploited_Kev | Oct 23, 202622 Oct 2026
- Actively_Exploited_Kev | Oct 22, 202621 Oct 2026
- 44 more on OTX