CVE-2025-4373

Glib: buffer underflow on glib through glib/gstring.c via function g_string_insert_unichar

MEDIUM
4.8
CVSS Score
Published: May 6, 2025 at 02:48 PM UTC
Updated: October 15, 2026 at 01:02 AM UTC
16 products affected across 2 vendorsEnterprise LinuxSIMATIC S7-1500 CPU 1518-4 Pn /dp MFP FirmwareSIMATIC S7-1500 CPU 1518F 4 Pn /dp MFP Firmware

Using N/A by N/A?

Get instant alerts when new vulnerabilities affect N/A - before attackers find them.

Real-time alertsTrack your software stackFree plan available
Severity
MEDIUM4.8
Exploit prediction
EPSS 0.6%
SSVC
No known exploit

Description

A flaw was found in GLib, which is vulnerable to an integer overflow in the g_string_insert_unichar() function. When the position at which to insert the character is large, the position will overflow, leading to a buffer underwrite.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Vendor states this is fixed in 0:2.56.4-10.el8_4.2 (unaffected)
Vendor states this is fixed in 0:2.56.4-158.el8_6.2 (unaffected)
Vendor states this is fixed in 0:2.56.4-162.el8_8 (unaffected)
Vendor states this is fixed in 0:2.56.4-166.el8_10 (unaffected)
Vendor states this is fixed in 0:2.56.4-8.el8_2.2 (unaffected)
Vendor states this is fixed in 0:2.68.4-14.el9_4.3 (unaffected)
Vendor states this is fixed in 0:2.68.4-16.el9_6.2 (unaffected)
Vendor states this is fixed in 0:2.68.4-5.el9_0.2 (unaffected)
Vendor states this is fixed in 0:2.68.4-7.el9_2.2 (unaffected)
Vendor states this is fixed in 0:2.80.4-4.el10_0.6 (unaffected)
v < V3.3
Affected range stops below V3.3, so it looks safe — our inference, not a vendor statement
v < V3.3
Affected range stops below V3.3, so it looks safe — our inference, not a vendor statement
v < V3.3
Affected range stops below V3.3, so it looks safe — our inference, not a vendor statement
v < V3.3
Affected range stops below V3.3, so it looks safe — our inference, not a vendor statement
v < V3.3
Affected range stops below V3.3, so it looks safe — our inference, not a vendor statement
v < V3.3
Affected range stops below V3.3, so it looks safe — our inference, not a vendor statement
v < V3.3
Affected range stops below V3.3, so it looks safe — our inference, not a vendor statement
v < V3.3
Affected range stops below V3.3, so it looks safe — our inference, not a vendor statement
v < V3.3
Affected range stops below V3.3, so it looks safe — our inference, not a vendor statement

References (17)

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

Attack Vector
NETWORK
Complexity
HIGH
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
LOW
Availability
LOW
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-124

Get alerted

Stop reading CVE feeds looking for your own stack

Track the products you run and VulnTracker tells you when a new CVE affects them — with what is known about fixing it, and nothing about the rest.

Free plan, no card