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CVE-2018-9988

25
FAUCET Score

CVE-2018-9988 is a buffer over-read vulnerability affecting ARM mbed TLS versions prior to 2.1.11, 2.7.2, and 2.8.0, as well as associated Debian Linux distributions. This flaw, rated High severity (CVSS 7.5), could lead to a denial-of-service condition (crash) due to invalid input during the ssl_parse_server_key_exchange() function. The attack requires no user interaction and has low attack complexity. There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage.

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
2.11%
Probability of exploitation in next 30 days
EPSS Percentile
79.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0211 is in the 64th percentile among its peer group of 51,553 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/027f84c69f4ef30c0693832a6c396ef19e563ca1
PatchThird Party Advisory
github.com / ARMmbed/mbedtls/commit/a1098f81c252b317ad34ea978aea2bc47760b215
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