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CVE-2018-9989

25
FAUCET Score

CVE-2018-9989 is a buffer over-read vulnerability in ARM mbed TLS versions before 2.1.11, 2.7.2, and 2.8.0, specifically within the ssl_parse_server_psk_hint() function. This flaw can lead to a denial of service (crash) when processing invalid input and affects ARM mbed TLS and Debian Linux distributions utilizing these vulnerable versions. The vulnerability has a CVSS v3.1 score of 7.5 (High), indicating it can be exploited remotely with low attack complexity and no user interaction, primarily impacting availability. While the FAUCET Risk Score is 50/100, its EPSS score is very low, suggesting a minimal probability of exploitation. Currently, there is no evidence of active exploitation, and no public exploit code is available in Metasploit, Nuclei, or ExploitDB. Community discussion and media coverage for this CVE are also minimal, aligning with the typical lack of attention for the majority of reported vulnerabilities.

Impacted Technologies

VendorProductVersion(s)CPE
< 2.1.11CPE matchmatch criteria
cpe:2.3:a:arm:mbed_tls:*:*:*:*:*:*:*:*
>= 2.7.0, < 2.7.2CPE matchmatch criteria
cpe:2.3:a:arm:mbed_tls:*:*:*:*:*:*:*:*
2.8.0CPE matchmatch criteria
cpe:2.3:a:trustedfirmware:mbed_tls:2.8.0:rc1:*:*:*:*:*:*
8.0CPE matchmatch criteria
cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*
9.0CPE matchmatch criteria
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
2.17%
Probability of exploitation in next 30 days
EPSS Percentile
80.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0217 is in the 65th percentile among its peer group of 51,506 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

github_advisorypatch availablevia nvd_reference
View patch

References

github.com / ARMmbed/mbedtls/commit/5224a7544c95552553e2e6be0b4a789956a6464e
PatchThird Party Advisory
github.com / ARMmbed/mbedtls/commit/740b218386083dc708ce98ccc94a63a95cd5629e
PatchThird Party Advisory
lists.debian.org / debian-lts-announce/2018/09/msg00029.html
Mailing ListThird Party Advisory
lists.debian.org / debian-lts-announce/2021/11/msg00021.html
Mailing ListThird Party Advisory
tls.mbed.org / tech-updates/releases/mbedtls-2.8.0-2.7.2-and-2.1.11-released
Release NotesVendor Advisory