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Ivanti Endpoint Manager Mobile (EPMM) Authentication Bypass Vulnerability

Exploited · KEV 2025-05-19Metasploit moduleCVE-2025-4427CWE-288

Exploited since 2025-05-19. 2 of 8 rule sources name it; Cloudflare blocks by default. Our CRS test: blocked.

Edge rules
2/8
Our test
Blocked
CVSS
5.3
EPSS
99.9% Top 0.1%
Posts, 14d
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Published
2025-05-13

An authentication bypass in the API component of Ivanti Endpoint Manager Mobile 12.5.0.0 and prior allows attackers to access protected resources without proper credentials via the API.

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AI · answers from this page
Ask about CVE-2025-4427: who's covered, what to patch first, how vendors compare. I cite sources and won't help with attacks.

Workers AI (Llama 3.3). Can be wrong: check the cited source.

Severity, decoded

CVSS 3.1
Medium · 5.3 / 10

Exploitable over the network, with no privileges and no user interaction, leading to low impact on confidentiality.

Over the internetNo login neededNo user actionWorks reliably
How the score is built8 metrics
  • Attack vectorAn attacker can reach it over the internet; no access to your network needed.
    Network
  • Attack complexityNo special conditions are needed; the attack works reliably.
    Low
  • Privileges requiredNo account or login is needed.
    None
  • User interactionNo one has to click or open anything; the attack works on its own.
    None
  • ScopeThe damage stays within the vulnerable component.
    Unchanged
  • Confidentiality impactAn attacker can read some data, but has no control over what they get.
    Low
  • Integrity impactData cannot be changed by the attacker.
    None
  • Availability impactThe component keeps working normally.
    None
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
CISA's assessmentSSVC, from the CVE record
ExploitationActive

Attackers are exploiting this in the wild.

AutomatableYes

Attackers can script the attack end to end and hit many targets at once.

Technical impactTotal

A successful attack gives full control over the affected software or all of its data.

Public exploits

3 found
1 Metasploit1 Exploit-DB1 Scanner template0 GitHub PoCs

Links are to third-party code: never run it outside an isolated lab.

Timeline

  1. 2025-05-13
    CVE published
    CVE List
  2. 2025-05-13
    Metasploit module published
    Ivanti EPMM Authentication Bypass for Expression Language Remote Code Execution
  3. 2025-05-19
    Added to CISA KEV
    Confirmed exploitation in the wild
  4. 2025-05-27
    Cloudflare ships a rule
    Ivanti EPMM - Auth Bypass - CVE:CVE-2025-4428, CVE:CVE-2025-4427
  5. 2025-06-30
    F5 ships a rule
    Ivanti EPMM Expression Injection
  6. 2025-08-26
    Exploit published on Exploit-DB
    Ivanti Endpoint Manager Mobile 12.5.0.0 - Authentication Bypass
  7. 2026-11-02
    Our test: OWASP Core Rule Set blocked it
    paranoia level 1, anomaly threshold 5, default CRS settings
  8. 2026-11-02
    Our test: OWASP Core Rule Set blocked it
    paranoia level 2, anomaly threshold 5, default CRS settings

Social

2026-10-20: 0 posts2026-10-21: 0 posts2026-10-22: 0 posts2026-10-23: 0 posts2026-10-24: 0 posts2026-10-25: 0 posts2026-10-26: 0 posts2026-10-27: 0 posts2026-10-28: 0 posts2026-10-29: 0 posts2026-10-30: 0 posts2026-10-31: 0 posts2026-11-01: 0 posts2026-11-02: 0 posts

No posts seen yet on X, Bluesky, Mastodon, Hacker News or GitHub.

Vendor statements

Quoted
CloudflareWAF Managed Rules1 quoteBlocks by default

First rule 2025-05-27, 14 days after the CVE was published.

2025-05-27New rule…60fc041cDefault: BlockSource
Ivanti EPMM - Auth Bypass - CVE:CVE-2025-4428, CVE:CVE-2025-4427. Previous action: Log. New action: Block. This is a New Detection
AWSAWS WAF Managed RulesNo public claim

We found no public statement from this vendor naming this CVE. That is not proof of no protection: generic rules may still catch it. AWS often describes a vulnerability without naming its CVE (for example "Log4j"). We count only entries that name the CVE, so AWS coverage is understated.

Microsoft AzureFront Door and Application Gateway WAF (DRS)No public claim

We found no public statement from this vendor naming this CVE. That is not proof of no protection: generic rules may still catch it. The rule tables name CVEs but carry no dates, so Azure is left out of every time-to-rule figure.

Google CloudCloud Armor preconfigured WAF rulesNo public claim

We found no public statement from this vendor naming this CVE. That is not proof of no protection: generic rules may still catch it. Google names few CVEs: the release notes start in May 2024 and the rules reference lists CVEs without dates. Its cve-canary rules are opt-in.

FastlyNext-Gen WAF virtual patchesBefore feed history

The CVE predates the oldest entry in this vendor's public feed, so a rule may exist that we cannot see.

F5Attack signatures (Distributed Cloud WAF)2 quotesRule published

First rule 2025-06-30, 48 days after the CVE was published.

2025-06-30New rule200204016Source
Added: signature 200204016 "Ivanti EPMM Expression Injection" (Server Side Code Injection, risk High), systems: Other Web Server. References: CVE-2025-4428, CVE-2025-4427.
2025-08-15New rule200204022Source
Added: signature 200204022 "Ivanti EPMM Expression Injection (2)" (Server Side Code Injection, risk High), systems: Other Web Server. References: CVE-2025-4428, CVE-2025-4427.
AkamaiApp & API Protector (Adaptive Security Engine)No public source

This vendor publishes no machine-readable rule changelog we can check.

OWASP CRSCore Rule Set (open source, used inside many WAFs)No public claim

We found no public statement from this vendor naming this CVE. That is not proof of no protection: generic rules may still catch it. CRS rarely names CVEs: it relies on generic detections. Our own lab measures what it actually blocks.