NVD / CVE Program· CNA Gallagher

CVE-2024-21838: Improper neutralization of special elements in output (CWE-74) used by the email generation feature of the Command Centre Server could lead

Noroxi assessment

Priority: Monitor (action score 21/100)

The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
Probability of exploitation in the next 30 days: 0.30% (FIRST EPSS).
Anyone who can reach it over the internet can trigger it. A low-privileged account is enough. A user must open a link or visit a page. No special conditions are required; it is repeatable.
According to the record, no fixed version is available yet.

Low priority for now. Update when a fix is released; follow the vendor's advisory.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

Improper neutralization of special elements in output (CWE-74) used by the email generation feature of the Command Centre Server could lead to HTML code injection in emails generated by Command Centre. This issue affects: Gallagher Command Centre 9.00 prior to vEL9.00.1774 (MR2), 8.90 prior to vEL8.90.1751 (MR3), 8.80 prior to vEL8.80.1526 (MR4), 8.70 prior to vEL8.70.2526 (MR6), all version of 8.60 and prior.

MediumCVSS 5.4 · v3.1—No exploit No fix recorded

Published: Mar 4, 2024
Updated: Jun 17, 2026
EPSS: 0.3% · 23th percentile
CWE: CWE-74

Report tools

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Action score

Monitor

Low priority for now.

CVSS: 21 / 40 · 5.4 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 0 / 30 · 0.3%

CISA SSVC decision

Exploitation: none
Automatable: no
Technical impact: partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD: 5.4
CNA · Gallagher: 6.8; 1.4 point gap

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:H/A:N

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

Not in KEV: no record of exploitation in the wild
No public exploit code on record
No fixed version yet

If any of these changes, we'll tell you in the daily email digest.

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

Vendor	Product	CPE
gallagher	command centre	cpe:2.3:a:gallagher:command_centre

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

gallagher command centreup to 8.60 inclusive
gallagher command centre8.70 and later · before 8.70.2526
gallagher command centre8.80 and later · before 8.80.1526
gallagher command centre8.90 and later · before 8.90.1751
gallagher command centre9.00 and later · before 9.00.1774

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Gallagher). Independent of NVD's CPE analysis and usually ahead of it.

Gallagher Command Centre Server
- up to and including 8.60affected
- 9.00 and later · before vEL9.00.1774 (MR2)affected
- 8.90 and later · before vEL8.90.1751 (MR3)affected
- 8.80 and later · before vEL8.80.1526 (MR4)affected
- 8.70 and later · before vEL8.70.2526affected

Same product

gallagher: all records

Other highest-scoring records for the same primary product.

CVE-2020-16098It is possible to enumerate access card credentials via an unauthenticated network connection to the server in versions of Command Centre v8
39Monitor
CVE-2019-15294An issue was discovered in Gallagher Command Centre 8.10 before 8.10.1092(MR2).
39Monitor
CVE-2020-16103Type confusion in Gallagher Command Centre Server allows a remote attacker to crash the server or possibly cause remote code execution.
36Monitor

Published before and after this one in the same product

← EarlierCVE-2023-46686Dec 18, 2023 · A reliance on untrusted inputs in a security decision could be exploited by a privileged user to configure the Gallagher Command Centre Dia
28Monitor
← EarlierCVE-2024-21815Mar 4, 2024 · Insufficiently protected credentials (CWE-522) for third party DVR integrations to the Command Centre Server are accessible to authenticate
26Monitor
Later →CVE-2024-23194Jul 10, 2024 · Improper output Neutralization for Logs (CWE-117) in the Command Centre API Diagnostics Endpoint could allow an attacker limited ability to
13Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

No fix version is recorded for this entry. Check the references for vendor advisories.

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

Anyone who can reach it over the internet can trigger it.
A low-privileged account is enough.
A user must open a link or visit a page.
No special conditions are required; it is repeatable.

If successful

Confidentiality: low · data can be read
Integrity: low · data or configuration can be modified
Availability: none

Impact can extend beyond the vulnerable component (scope changes).

Attack vector: Network
Attack complexity: Low
Privileges required: Low
User interaction: Required
Scope: Changed
Confidentiality impact: Low
Integrity impact: Low
Availability impact: None

Weakness class (CWE)

CWE-74 · Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Attack patterns (CAPEC)

ATT&CK techniques

Change log

No changes recorded on tracked fields yet. Score, KEV, exploit maturity and fix status changes appear here.

References

security.gallagher.com/en-NZ/Security-Advisories/CVE-2024-21838

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records