How severe is CVE-2025-48839?

CVE-2025-48839 has a CVSS 3.x base score of 6.6, rated medium severity. It is exploitable over network with high attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2025-48839 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (25th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-48839?

CVE-2025-48839 primarily affects Fortinet Fortiadc. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2025-48839?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2025-48839 have an EU (EUVD) identifier?

Yes. CVE-2025-48839 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-198007.

When was CVE-2025-48839 published?

CVE-2025-48839 was published on 2025-11-18 and last updated on 2026-06-17.

CVE-2025-48839

CVE-2025-48839 is a medium-severity vulnerability in Fortinet Fortiadc with a CVSS 3.x base score of 6.6. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-787.

Key facts

Severity: Medium (CVSS 3.x base score 6.6)
EPSS exploit prediction: 0% (25th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-198007
Weakness: CWE-787
Affected product: Fortinet Fortiadc
Published: 2025-11-18
Last modified: 2026-06-17

Description

An Out-of-bounds Write vulnerability [CWE-787] in FortiADC 8.0.0, 7.6.0 through 7.6.2, 7.4.0 through 7.4.7, 7.2 all versions, 7.1 all versions, 7.0 all versions, 6.2 all versions may allow an authenticated attacker to execute arbitrary code via specially crafted HTTP requests.

Frequently asked questions

What is CVE-2025-48839?: An Out-of-bounds Write vulnerability [CWE-787] in FortiADC 8.0.0, 7.6.0 through 7.6.2, 7.4.0 through 7.4.7, 7.2 all versions, 7.1 all versions, 7.0 all versions, 6.2 all versions may allow an authenticated attacker to execute arbitrary code via specially crafted HTTP requests.
How severe is CVE-2025-48839?: CVE-2025-48839 has a CVSS 3.x base score of 6.6, rated medium severity. It is exploitable over network with high attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2025-48839 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (25th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-48839?: CVE-2025-48839 primarily affects Fortinet Fortiadc. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2025-48839?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-48839 have an EU (EUVD) identifier?: Yes. CVE-2025-48839 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-198007.
When was CVE-2025-48839 published?: CVE-2025-48839 was published on 2025-11-18 and last updated on 2026-06-17.

References

https://fortiguard.fortinet.com/psirt/FG-IR-25-225

Affected products (2)

cpe:2.3:a:fortinet:fortiadc:*:*:*:*:*:*:*:*
cpe:2.3:a:fortinet:fortiadc:8.0.0:*:*:*:*:*:*:*

More vulnerabilities in Fortinet Fortiadc

CVE-2023-37933 — High (CVSS 8.8): An improper neutralization of input during web page generation ('Cross-site Scripting') vulnerability [CWE-79] in…
CVE-2022-39947 — High (CVSS 8.8): A improper neutralization of special elements used in an os command ('os command injection') in Fortinet FortiADC…
CVE-2022-38374 — High (CVSS 8.8): A improper neutralization of input during web page generation ('cross-site scripting') in Fortinet FortiADC 7.0.0 -…
CVE-2023-26205 — High (CVSS 8.1): An improper access control vulnerability [CWE-284] in FortiADC automation feature 7.1.0 through 7.1.2, 7.0 all…
CVE-2022-35851 — High (CVSS 8.0): An improper neutralization of input during web page generation vulnerability [CWE-79] in FortiADC management interface…
CVE-2023-25607 — High (CVSS 7.8): An improper neutralization of special elements used in an OS Command ('OS Command Injection') vulnerability [CWE-78 ]…

All CVEs affecting Fortinet Fortiadc →

Other CWE-787 (Out-of-bounds Write) vulnerabilities

CVE-2026-42369 — Critical (CVSS 10.0): GV-VMS V20 is a Video Monitoring Software used to gather the feeds of many surveillance cameras and manage other…
CVE-2026-4746 — Critical (CVSS 10.0): Out-of-bounds Write vulnerability in timeplus-io proton (base/poco/Foundation/src‎ modules). This vulnerability is…
CVE-2025-43300 — Critical (CVSS 10.0): An out-of-bounds write issue was addressed with improved bounds checking. This issue is fixed in iOS 15.8.5 and iPadOS…
CVE-2025-24201 — Critical (CVSS 10.0): An out-of-bounds write issue was addressed with improved checks to prevent unauthorized actions. This issue is fixed in…
CVE-2024-42479 — Critical (CVSS 10.0): llama.cpp provides LLM inference in C/C++. The unsafe `data` pointer member in the `rpc_tensor` structure can cause…
CVE-2024-39791 — Critical (CVSS 10.0): Stack-based buffer overflow vulnerabilities affecting Vonets industrial wifi bridge relays and wifi bridge…

Browse all CWE-787 (Out-of-bounds Write) vulnerabilities →