How severe is CVE-2026-31256?

CVE-2026-31256 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2026-31256 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (33rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-31256?

CVE-2026-31256 affects Mercurycom Mipc252w Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-31256?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-31256 have an EU (EUVD) identifier?

Yes. CVE-2026-31256 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-25899.

When was CVE-2026-31256 published?

CVE-2026-31256 was published on 2026-04-27 and last updated on 2026-06-17.

CVE-2026-31256

CVE-2026-31256 is a high-severity vulnerability in Mercurycom Mipc252w Firmware with a CVSS 3.x base score of 7.5. 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: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 0% (33rd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-25899
Weakness: CWE-476
Affected product: Mercurycom Mipc252w Firmware
Published: 2026-04-27
Last modified: 2026-06-17

Description

A null pointer dereference vulnerability exists in the RTSP service of the MERCURY MIPC252W 1.0.5 Build 230306 Rel.79931n. During the processing of a SETUP request for the path rtsp://<IP>:554/stream1/track2, the device fails to properly validate the Transport header field. When this header is improperly constructed, the RTSP service can dereference a NULL pointer during request parsing. Successful exploitation causes the device to crash and automatically reboot.

Frequently asked questions

What is CVE-2026-31256?: A null pointer dereference vulnerability exists in the RTSP service of the MERCURY MIPC252W 1.0.5 Build 230306 Rel.79931n. During the processing of a SETUP request for the path rtsp://<IP>:554/stream1/track2, the device fails to properly validate the Transport header field. When this header is improperly constructed, the RTSP service can dereference a NULL pointer during request parsing. Successful exploitation causes the device to crash and automatically reboot.
How severe is CVE-2026-31256?: CVE-2026-31256 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2026-31256 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (33rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-31256?: CVE-2026-31256 affects Mercurycom Mipc252w Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-31256?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-31256 have an EU (EUVD) identifier?: Yes. CVE-2026-31256 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-25899.
When was CVE-2026-31256 published?: CVE-2026-31256 was published on 2026-04-27 and last updated on 2026-06-17.

References

https://github.com/izxnfirh8148/CVE_REQUESTS_references/blob/main/MERCURY_MIPC252W/MERCURY_MIPC252W_1th/README.md

Affected products (1)

cpe:2.3:o:mercurycom:mipc252w_firmware:1.0.5:build_230306:*:*:*:*:*:*

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