CVE-2024-5217: ServiceNow Incomplete List of Disallowed Inputs Vulnerability

Should you act?

Exploited: patch now if you run it

CISA has confirmed exploitation in the wild. This signal is computed from CISA KEV, EPSS and CVSS data; it is not an editorial verdict.

• Yes, if you run ServiceNow Utah, Vancouver, and Washington DC Now Platform. CISA added this CVE to its Known Exploited Vulnerabilities catalog on 2024-07-29, which means there is reliable evidence of exploitation in the wild. US federal agencies must remediate by 2024-08-19; treat that as the outer limit, not the target.
• EPSS 99.6%, percentile 99.9: FIRST’s model estimates a 99.6% chance of exploitation activity in the next 30 days, higher than 99.9% of all scored CVEs (very high). EPSS is a probability, not a verdict.
• Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.

What it is

ServiceNow has addressed an input validation vulnerability that was identified in the Washington DC, Vancouver, and earlier Now Platform releases. This vulnerability could enable an unauthenticated user to remotely execute code within the context of the Now Platform. The vulnerability is addressed in the listed patches and hot fixes below, which were released during the June 2024 patching cycle. If you have not done so already, we recommend applying security patches relevant to your instance as soon as possible.

CISA’s summary

ServiceNow Washington DC, Vancouver, and earlier Now Platform releases contain an incomplete list of disallowed inputs vulnerability in the GlideExpression script. An unauthenticated user could exploit this vulnerability to execute code remotely.

Weakness type: CWE-184.

Product: ServiceNow Utah, Vancouver, and Washington DC Now Platform · Assigned by: SN · Published: 2024-07-10

Affected and fixed versions

Severity scores

• Attack vector: network (remotely reachable)
• Attack complexity: low
• Attack requirements: present (depends on deployment conditions)
• Privileges required: none (no login)
• User interaction: none

CVSS measures how bad a flaw is if exploited, not how likely exploitation is. Read it next to the exploitation data below.

Exploitation and urgency

• CISA KEV: added 2024-07-29; federal due date 2024-08-19. Known ransomware use: Unknown.
• CISA required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
• CISA SSVC assessment: exploitation active, automatable yes, technical impact total.
• FIRST EPSS (model of 2026-10-21): 99.63% probability of exploitation activity in the next 30 days; percentile 99.9.

Timeline

• 2024-07-10 — CVE record published by SN
• 2024-07-29 — Added to CISA’s Known Exploited Vulnerabilities catalog
• 2024-08-19 — CISA remediation deadline for US federal agencies
• 2025-10-21 — CVE record last updated

Sources and references

Original sources first. Version and fix details should always be confirmed against the vendor or project advisory.

Vendor and project advisories, patches

1. Listed in CISA KEV notes (support.servicenow.com) support.servicenow.com

Vulnerability records

1. CVE.org record CVE-2024-5217 cve.org
2. NVD entry CVE-2024-5217 nvd.nist.gov

Government

1. CISA Known Exploited Vulnerabilities catalog entry cisa.gov

Other references from the CVE record and advisory

1. support.servicenow.com support.servicenow.com
2. darkreading.com darkreading.com

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