CVE-2018-15807: POSIM EVO 15.13 for Windows includes an "Emergency Override" administrative account that may be accessed throu

Routine

HIGH 7.8DOWNGRADE

CVE-2018-15807 is a high-severity flaw (CVSS 7.8) affecting evo. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

POSIM EVO 15.13 for Windows includes an "Emergency Override" administrative account that may be accessed through POSIM's "override" feature. This Override prompt expects a code that is computed locally using a deterministic algorithm. This code may be generated by an attacker and used to bypass any POSIM EVO login prompt.

Why this priority

High severity

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	7.8 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.3% (top 72%)
CISA exploited list	No
Weakness	CWE-330
Published	2018-08-23
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: posim

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2018-08-23 20:29 UTCPublished CVE record published
2026-06-17 01:43 UTCUpdated Record last modified

posim evo DOWNGRADE

Affected: 15.13

Fixed in: no fixed release known

Safe to downgrade to: a release before 15.13

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 15.13 (Debian / Ubuntu)

apt-cache madison evo sudo apt install evo=<VERSION_BEFORE_15.13> sudo apt-mark hold evo

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list evo sudo dnf downgrade evo-<VERSION_BEFORE_15.13> sudo dnf versionlock add evo

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

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-2018-15807?

evo: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2018-15807 being exploited?

CVE-2018-15807 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-2018-15807 affect?

CVE-2018-15807 affects evo. Severity is high (CVSS 7.8). POSIM EVO 15.13 for Windows includes an "Emergency Override" administrative account that may be accessed through POSIM's "override" feature. This Override prompt expects a code that is computed locally using a deterministic algorithm. This

How urgent is CVE-2018-15807?

Priority 34/100. High severity

Software pages

Windows vulnerabilities

Related CVEs

CVE-2018-15808 CRITICAL 9.8 DOWNGRADE POSIM EVO 15.13 for Windows includes hardcoded database credentials for the "root" database user

References

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