What’s Vulnerable › Vulnerabilities

CVE-2018-9989

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2018-04-10 · updated 2026-06-17
• Weakness: CWE-125

Description

ARM mbed TLS before 2.1.11, before 2.7.2, and before 2.8.0 has a buffer over-read in ssl_parse_server_psk_hint() that could cause a crash on invalid input.

Affected products

• mbedtls: before 2.1.11; from 2.7.0 before 2.7.2 — fixed in 2.1.11, 2.7.2
• Debian Linux: 8.0, 9.0
• TrustedFirmware Mbed TLS: 2.8.0-rc1

How to fix

Upgrade to a fixed version: mbedtls 2.1.11, 2.7.2. Check the vendor advisory for mitigations.

References

• https://github.com/ARMmbed/mbedtls/commit/5224a7544c95552553e2e6be0b4a789956a6464e
• https://github.com/ARMmbed/mbedtls/commit/740b218386083dc708ce98ccc94a63a95cd5629e
• https://lists.debian.org/debian-lts-announce/2018/09/msg00029.html
• https://lists.debian.org/debian-lts-announce/2021/11/msg00021.html
• https://tls.mbed.org/tech-updates/releases/mbedtls-2.8.0-2.7.2-and-2.1.11-released
• https://github.com/ARMmbed/mbedtls/commit/5224a7544c95552553e2e6be0b4a789956a6464e
• https://github.com/ARMmbed/mbedtls/commit/740b218386083dc708ce98ccc94a63a95cd5629e
• https://lists.debian.org/debian-lts-announce/2018/09/msg00029.html
• https://lists.debian.org/debian-lts-announce/2021/11/msg00021.html
• https://tls.mbed.org/tech-updates/releases/mbedtls-2.8.0-2.7.2-and-2.1.11-released

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