7.5

CVE-2023-24021: debian debian_linux Improper Null Termination

Modified
AliasesSUSE-SU-2023:0431-1SUSE-SU-2023:0447-1UBUNTU-CVE-2023-24021
Published 20-01-2023Last modified 02-04-2025

Vulnerability summary

CVE-2023-24021 is a high (CVSS 7.5) Improper Null Termination vulnerability in debian debian_linux. EPSS estimates a 0.93% chance of exploitation in the next 30 days, higher than 60.7% of scored vulnerabilities.

Priority
Prioritisesevere

Severe, CVSS 7.5 (CVE.org); no exploitation reported by the 5 checked sources; EPSS 1% (FIRST, 03-11-2026)

Source freshness unavailable

How is this decided?
CVSS score
7.5/10
010
High · v3.1 (CVE.org)
EPSS score
0.93%
0%100%
Low · +0.03 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 4 · Related 1
DLA-3283-1MGASA-2023-0175RHSA-2023:4629USN-6370-1

Timeline

  1. 20-01-2023
    PublishedVulnerability first disclosed.
  2. 02-04-2025
    Last modifiedVulnerability information updated.

Description

Incorrect handling of '\0' bytes in file uploads in ModSecurity before 2.9.7 may allow for Web Application Firewall bypasses and buffer over-reads on the Web Application Firewall when executing rules that read the FILES_TMP_CONTENT collection.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.93%

Chance of exploitation in the next 30 days

Percentile

61%

Versus all other CVEs

30-day change

Increase +0.03 pp

From 0.91% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Suse17 products
  • apache2-mod_security2&distro=SUSE Enterprise Storage 7< 2.9.2-150000.3.9.1
  • apache2-mod_security2&distro=SUSE Enterprise Storage 7.1< 2.9.2-150000.3.9.1
  • apache2-mod_security2&distro=SUSE Linux Enterprise High Performance Computing 15 SP1-LTSS< 2.9.2-150000.3.9.1
  • apache2-mod_security2&distro=SUSE Linux Enterprise High Performance Computing 15 SP2-LTSS< 2.9.2-150000.3.9.1
  • apache2-mod_security2&distro=SUSE Linux Enterprise High Performance Computing 15 SP3-ESPOS< 2.9.2-150000.3.9.1
Debian2 products
Opensuse1 product
  • apache2-mod_security2&distro=openSUSE Leap 15.4< 2.9.4-150400.3.6.1
Trustwave1 product
Ubuntu1 product
  • modsecurity-apache< 2.9.0-1ubuntu0.1~esm1 | < 2.9.2-1ubuntu0.1~esm1 | < 2.9.3-1ubuntu0.1 | < 2.9.5-1ubuntu0.1~esm1

5 vendors · 22 products

References

17 links
Show all 17 references