How severe is CVE-2025-11847?

CVE-2025-11847 has a CVSS 3.x base score of 4.9, rated medium severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2025-11847 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (74th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-11847?

CVE-2025-11847 primarily affects Zyxel Ex3510-b1 Firmware. In total, 54 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2025-11847?

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

Does CVE-2025-11847 have an EU (EUVD) identifier?

Yes. CVE-2025-11847 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-207553.

When was CVE-2025-11847 published?

CVE-2025-11847 was published on 2026-02-24 and last updated on 2026-06-17.

CVE-2025-11847

CVE-2025-11847 is a medium-severity vulnerability in Zyxel Ex3510-b1 Firmware with a CVSS 3.x base score of 4.9. 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-476.

Key facts

Severity: Medium (CVSS 3.x base score 4.9)
EPSS exploit prediction: 2% (74th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-207553
Weakness: CWE-476
Affected product: Zyxel Ex3510-b1 Firmware
Published: 2026-02-24
Last modified: 2026-06-17

Description

A null pointer dereference vulnerability in the IP settings CGI program of the Zyxel VMG3625-T50B firmware versions through 5.50(ABPM.9.6)C0 and the Zyxel WX3100-T0 firmware versions through 5.50(ABVL.4.8)C0 could allow an authenticated attacker with administrator privileges to trigger a denial-of-service (DoS) condition by sending a crafted HTTP request.

Frequently asked questions

What is CVE-2025-11847?: A null pointer dereference vulnerability in the IP settings CGI program of the Zyxel VMG3625-T50B firmware versions through 5.50(ABPM.9.6)C0 and the Zyxel WX3100-T0 firmware versions through 5.50(ABVL.4.8)C0 could allow an authenticated attacker with administrator privileges to trigger a denial-of-service (DoS) condition by sending a crafted HTTP request.
How severe is CVE-2025-11847?: CVE-2025-11847 has a CVSS 3.x base score of 4.9, rated medium severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2025-11847 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (74th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-11847?: CVE-2025-11847 primarily affects Zyxel Ex3510-b1 Firmware. In total, 54 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2025-11847?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-11847 have an EU (EUVD) identifier?: Yes. CVE-2025-11847 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-207553.
When was CVE-2025-11847 published?: CVE-2025-11847 was published on 2026-02-24 and last updated on 2026-06-17.

References

https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-null-pointer-dereference-and-command-injection-vulnerabilities-in-certain-4g-lte-5g-nr-cpe-dsl-ethernet-cpe-fiber-onts-security-routers-and-wireless-extenders-02-24-2026

Affected products (54)

cpe:2.3:o:zyxel:ex3510-b1_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:ex3600-t0_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:ex5401-b1_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:ex5510-b0_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:ex5512-t0_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:ex5601-t0_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:ex5601-t1_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:ex7501-b0_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:ex7710-b0_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:gm4100-b0_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:pm7500-00_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:vmg3625-t50b_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:vmg4005-b50a_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:vmg4005-b60a_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:ax7501-b1_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:pe3301-00_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:pe5301-01_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:pm3100-t0_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:pm5100-t0_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:pm5100-t1_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:pm7300-t0_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:px3321-t1_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:px5301-t0_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:scr_50axe_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:vmg8623-t50b_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:we3300-00_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:wx3100-t0_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:wx3401-b1_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:wx5600-t0_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:wx5610-b0_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:ex3510-b0_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:ex3501-t0_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:ex3500-t0_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:ex3301-t0_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:ex3300-t1_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:ex3300-t0_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:ex2210-t0_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:emg5523-t50b_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:nebula_lte3301-plus_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:emg3525-t50b_firmware:*:*:*:*:*:*:*:*

More vulnerabilities in Zyxel Ex3510-b1 Firmware

CVE-2025-13942 — Critical (CVSS 9.8): A command injection vulnerability in the UPnP function of the Zyxel EX3510-B0 firmware versions through…
CVE-2025-13943 — High (CVSS 8.8): A post-authentication command injection vulnerability in the log file download function of the Zyxel EX3301-T0 firmware…
CVE-2025-8693 — High (CVSS 8.8): A post-authentication command injection vulnerability in the "priv" parameter of Zyxel DX3300-T0 firmware version…
CVE-2024-8748 — High (CVSS 7.5): A buffer overflow vulnerability in the packet parser of the third-party library "libclinkc" in Zyxel VMG8825-T50K…
CVE-2024-12010 — High (CVSS 7.2): A post-authentication command injection vulnerability in the ”zyUtilMailSend” function of the Zyxel AX7501-B1…
CVE-2024-12009 — High (CVSS 7.2): A post-authentication command injection vulnerability in the "ZyEE" function of the Zyxel EX5601-T1 firmware version…

All CVEs affecting Zyxel Ex3510-b1 Firmware →

Other CWE-476 (NULL Pointer Dereference) vulnerabilities

CVE-2022-36648 — Critical (CVSS 10.0): The hardware emulation in the of_dpa_cmd_add_l2_flood of rocker device model in QEMU, as used in 7.0.0 and earlier,…
CVE-2020-14500 — Critical (CVSS 10.0): Secomea GateManager all versions prior to 9.2c, An attacker can send a negative value and overwrite arbitrary data.
CVE-2010-2495 — Critical (CVSS 10.0): The pppol2tp_xmit function in drivers/net/pppol2tp.c in the L2TP implementation in the Linux kernel before 2.6.34 does…
CVE-2026-46195 — Critical (CVSS 9.8): In the Linux kernel, the following vulnerability has been resolved: smb: client: validate dacloffset before building…
CVE-2026-31657 — Critical (CVSS 9.8): In the Linux kernel, the following vulnerability has been resolved: batman-adv: hold claim backbone gateways by…
CVE-2026-31436 — Critical (CVSS 9.8): In the Linux kernel, the following vulnerability has been resolved: dmaengine: idxd: fix possible wrong descriptor…

Browse all CWE-476 (NULL Pointer Dereference) vulnerabilities →