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CVE-2018-11503

19
FAUCET Score

CVE-2018-11503 is a heap-based buffer over-read vulnerability in the isfootnote function of libmarkdown.a in DISCOUNT 2.2.3a, affecting products like Debian Linux and Discount Project. This medium-severity flaw (CVSS 5.5) can lead to a denial of service through a crafted file, requiring user interaction to trigger. There is no evidence of active exploitation, public exploit code, or significant community discussion, indicating a low current threat level.

Impacted Technologies

VendorProductVersion(s)CPE
2.2.3CPE matchmatch criteria
cpe:2.3:a:discount_project:discount:2.2.3:a:*:*:*:*:*:*
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: 3.0

5.5MEDIUM

CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
1.8
Impact Score
3.6
CvssVersion
3.0

Exploit Intelligence

EPSS Score
1.60%
Probability of exploitation in next 30 days
EPSS Percentile
73.3%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0160 is in the 84th percentile among its peer group of 5,758 CVEs.

Social Chatter

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

Vendor Patches (1)

redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 8Fixed in: discount

Vendor Advisories (1)

redhatCVE-2018-11503Low

discount: Heap-based buffer-overflow in markdown.c:isfootnote() allows for denial of service

May 26, 2018

References

github.com / Orc/discount/issues/189
Issue TrackingThird Party Advisory
lists.debian.org / debian-lts-announce/2018/09/msg00009.html
Mailing ListThird Party Advisory
debian.org / security/2018/dsa-4293
Third Party Advisory