Vulnerability record · CVE-2019-3993 · published 17 December 2019
CVE-2019-3993: ELOG unauthenticated password hash disclosure via crafted HTTP POST
Elog Project · Elog
ELOG 3.1.4-57bea22 and below exposes user password hashes to a remote attacker who sends a crafted HTTP POST request. No authentication or user interaction is required, so any network-reachable ELOG instance can leak credential material. The flaw is an information exposure issue, with a secondary cleartext transmission classification.
Description
ELOG 3.1.4-57bea22 and below is affected by an information disclosure vulnerability. A remote unauthenticated attacker can recover a user's password hash by sending a crafted HTTP POST request.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Automated analysis
high priorityUnauthenticated remote disclosure of password hashes with a high EPSS score and public exploit reference warrants prompt patching despite no KEV listing.
What it is
ELOG 3.1.4-57bea22 and below exposes user password hashes to a remote attacker who sends a crafted HTTP POST request. No authentication or user interaction is required, so any network-reachable ELOG instance can leak credential material. The flaw is an information exposure issue, with a secondary cleartext transmission classification.
Impact
An attacker obtains password hashes for ELOG users, enabling offline cracking and credential reuse against other systems. This is a confidentiality-only impact; no integrity or availability loss is described.
Attack surface
Reached over the network via HTTP POST to the ELOG service, per the CVSS vector AV:N/AC:L/PR:N/UI:N. No authentication or user interaction is needed.
Exploitation
Not listed in CISA KEV and no ransomware association is documented, but EPSS is 0.45698 (98.7th percentile) and a Tenable research reference is tagged Exploit, indicating public exploit material exists.
What to do
- Upgrade ELOG to a version above 3.1.4-57bea22; apply the Fedora package updates referenced in the advisory.
- Restrict network access to the ELOG service to trusted hosts or place it behind an authenticated reverse proxy.
- Serve ELOG over HTTPS only and avoid transmitting credentials or hashes in cleartext.
- Rotate ELOG user passwords and any reused credentials after exposure is suspected.
Detection
- Monitor HTTP POST requests to ELOG endpoints for anomalous or unexpected parameters that could trigger hash disclosure.
- Alert on outbound connections from the ELOG host that may indicate exfiltration of credential data.
- Review ELOG access logs for unauthenticated POST requests from unfamiliar source IPs.
This assessment is produced automatically and is not human-reviewed. Verify against the vendor advisory before acting on it.
Affected products
2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.
References
Track CVE-2019-3993 inside VULONE
Watch it alongside the ransomware crews, C2 infrastructure and forum chatter that reference it, query it through the API and pull it into your SIEM over TAXII.
Related vulnerabilities
Same products first, then exploited flaws of the same weakness class.
Source: NIST National Vulnerability Database (record CVE-2019-3993), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.
