Discount 2.2.3a markdown.c isfootnote Markdown memory corruption

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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A vulnerability classified as critical was found in Discount 2.2.3a. Affected by this vulnerability is the function isfootnote of the file markdown.c. The manipulation as part of a Markdown leads to a memory corruption vulnerability. The CWE definition for the vulnerability is CWE-119. The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. As an impact it is known to affect confidentiality, integrity, and availability.

The bug was discovered 05/23/2018. The weakness was released 05/26/2018 (Website). The advisory is shared at This vulnerability is known as CVE-2018-11503 since 05/26/2018. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details are known, but no exploit is available.

The vulnerability was handled as a non-public zero-day exploit for at least 3 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 117503 (Debian DSA-4293-1 : discount - security update), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Debian Local Security Checks and running in the context l.

Upgrading eliminates this vulnerability. A possible mitigation has been published 4 months after the disclosure of the vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (117503). Entries connected to this vulnerability are available at 118219, 118262 and 119606.





  • end of life (old version)

CPE 2.3info

CPE 2.2info


VulDB Meta Base Score: 6.4
VulDB Meta Temp Score: 6.3

VulDB Base Score: 7.3
VulDB Temp Score: 7.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.5
NVD Vector: 🔍



VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍


Class: Memory corruption
CWE: CWE-119
ATT&CK: Unknown

Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍


Nessus ID: 117503
Nessus Name: Debian DSA-4293-1 : discount - security update
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍


Recommended: Upgrade
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍


05/23/2018 🔍
05/26/2018 +2 days 🔍
05/26/2018 +0 days 🔍
05/26/2018 +0 days 🔍
05/27/2018 +1 days 🔍
09/14/2018 +110 days 🔍
09/17/2018 +3 days 🔍
03/17/2023 +1642 days 🔍


Advisory: 189
Status: Not defined

CVE: CVE-2018-11503 (🔍)
See also: 🔍


Created: 05/27/2018 11:16 AM
Updated: 03/17/2023 11:42 AM
Changes: 05/27/2018 11:16 AM (71), 02/09/2020 09:00 AM (3), 03/17/2023 11:35 AM (4), 03/17/2023 11:42 AM (1)
Complete: 🔍


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