How severe is CVE-2023-31475?

CVE-2023-31475 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2023-31475 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 14% (96th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-31475?

CVE-2023-31475 primarily affects Gl-inet Gl-s20 Firmware. In total, 32 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2023-31475?

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

When was CVE-2023-31475 published?

CVE-2023-31475 was published on 2023-05-11 and last updated on 2026-06-17.

CVE-2023-31475

CVE-2023-31475 is a critical-severity vulnerability in Gl-inet Gl-s20 Firmware with a CVSS 3.x base score of 9.8. Its EPSS exploit-prediction score of 14% places it in the 96th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-120.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
EPSS exploit prediction: 14% (96th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-120
Affected product: Gl-inet Gl-s20 Firmware
Published: 2023-05-11
Last modified: 2026-06-17

Description

An issue was discovered on GL.iNet devices before 3.216. The function guci2_get() found in libglutil.so has a buffer overflow when an item is requested from a UCI context, and the value is pasted into a char pointer to a buffer without checking the size of the buffer.

Frequently asked questions

What is CVE-2023-31475?: An issue was discovered on GL.iNet devices before 3.216. The function guci2_get() found in libglutil.so has a buffer overflow when an item is requested from a UCI context, and the value is pasted into a char pointer to a buffer without checking the size of the buffer.
How severe is CVE-2023-31475?: CVE-2023-31475 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2023-31475 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 14% (96th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-31475?: CVE-2023-31475 primarily affects Gl-inet Gl-s20 Firmware. In total, 32 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2023-31475?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2023-31475 published?: CVE-2023-31475 was published on 2023-05-11 and last updated on 2026-06-17.

References

Affected products (32)

cpe:2.3:o:gl-inet:gl-s20_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:gl-inet:gl-x3000_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:gl-inet:gl-mt3000_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:gl-inet:gl-mt2500_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:gl-inet:gl-mt2500a_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:gl-inet:gl-axt1800_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:gl-inet:gl-a1300_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:gl-inet:gl-ax1800_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:gl-inet:gl-sft1200_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:gl-inet:gl-mt1300_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:gl-inet:gl-e750_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:gl-inet:gl-mv1000_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:gl-inet:gl-mv1000w_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:gl-inet:gl-s10_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:gl-inet:gl-s200_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:gl-inet:gl-s1300_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:gl-inet:gl-sf1200_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:gl-inet:gl-b1300_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:gl-inet:gl-b2200_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:gl-inet:gl-ap1300_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:gl-inet:gl-ap1300lte_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:gl-inet:gl-x1200_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:gl-inet:gl-x750_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:gl-inet:gl-x300b_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:gl-inet:gl-xe300_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:gl-inet:gl-ar750s_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:gl-inet:gl-ar750_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:gl-inet:gl-mifi_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:gl-inet:gl-mt300n-v2_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:gl-inet:gl-ar300m_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:gl-inet:gl-usb150_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:gl-inet:microuter-n300_firmware:*:*:*:*:*:*:*:*

More vulnerabilities in Gl-inet Gl-s20 Firmware

CVE-2023-31471 — Critical (CVSS 9.8): An issue was discovered on GL.iNet devices before 3.216. Through the software installation feature, it is possible to…
CVE-2023-31477 — High (CVSS 7.5): A path traversal issue was discovered on GL.iNet devices before 3.216. Through the file sharing feature, it is possible…
CVE-2023-31478 — High (CVSS 7.5): An issue was discovered on GL.iNet devices before 3.216. An API endpoint reveals information about the Wi-Fi…
CVE-2023-31474 — High (CVSS 7.5): An issue was discovered on GL.iNet devices before 3.216. Through the software installation feature, it is possible to…
CVE-2023-31472 — High (CVSS 7.5): An issue was discovered on GL.iNet devices before 3.216. There is an arbitrary file write in which an empty file can be…
CVE-2023-31473 — Medium (CVSS 4.9): An issue was discovered on GL.iNet devices before 3.216. There is an arbitrary file write in which an empty file can be…

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