How severe is CVE-2023-26243?

CVE-2023-26243 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2023-26243 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (27th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-26243?

CVE-2023-26243 affects Hyundai Gen5w L Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-26243?

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.

When was CVE-2023-26243 published?

CVE-2023-26243 was published on 2023-04-27 and last updated on 2026-06-17.

CVE-2023-26243

CVE-2023-26243 is a high-severity vulnerability in Hyundai Gen5w L Firmware with a CVSS 3.x base score of 7.8. 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-269.

Key facts

Severity: High (CVSS 3.x base score 7.8)
EPSS exploit prediction: 0% (27th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-269
Affected product: Hyundai Gen5w L Firmware
Published: 2023-04-27
Last modified: 2026-06-17

Description

An issue was discovered in the Hyundai Gen5W_L in-vehicle infotainment system AE_E_PE_EUR.S5W_L001.001.211214. The decryption binary used to decrypt firmware files has an information leak that allows an attacker to read the AES key and initialization vector from memory. An attacker may exploit this to create custom firmware that may be installed in the IVI system. Then, an attacker may be able to install a backdoor in the IVI system that may allow him to control it, if it is connected to the Internet through Wi-Fi.

Frequently asked questions

What is CVE-2023-26243?: An issue was discovered in the Hyundai Gen5W_L in-vehicle infotainment system AE_E_PE_EUR.S5W_L001.001.211214. The decryption binary used to decrypt firmware files has an information leak that allows an attacker to read the AES key and initialization vector from memory. An attacker may exploit this to create custom firmware that may be installed in the IVI system. Then, an attacker may be able to install a backdoor in the IVI system that may allow him to control it, if it is connected to the Internet through Wi-Fi.
How severe is CVE-2023-26243?: CVE-2023-26243 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2023-26243 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (27th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-26243?: CVE-2023-26243 affects Hyundai Gen5w L Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-26243?: 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.
When was CVE-2023-26243 published?: CVE-2023-26243 was published on 2023-04-27 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:hyundai:gen5w_l_firmware:ae_e_pe_eur.s5w_l001.001.211214:*:*:*:*:*:*:*

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CVE-2023-26246 — High (CVSS 7.8): An issue was discovered in the Hyundai Gen5W_L in-vehicle infotainment system AE_E_PE_EUR.S5W_L001.001.211214. The…
CVE-2023-26245 — High (CVSS 7.8): An issue was discovered in the Hyundai Gen5W_L in-vehicle infotainment system AE_E_PE_EUR.S5W_L001.001.211214. The…
CVE-2023-26244 — High (CVSS 7.8): An issue was discovered in the Hyundai Gen5W_L in-vehicle infotainment system AE_E_PE_EUR.S5W_L001.001.211214. The…

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