CVE-2018-20657

Exp

The demangle_template function in cplus-dem.c in GNU libiberty, as distributed in GNU Binutils 2.31.1, has a memory leak via a crafted string, leading to a denial of service (memory consumption), as demonstrated by cxxfilt, a related issue to CVE-2018-12698.

Published: 2019-01-02 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2018-20657 is rated High Exploit Risk (79.6/100): CVSS High severity, with medium exploitation likelihood (EPSS 4.00%). 1 public exploit reference(s) are indexed (Exploit-DB). EPSS rose +3.36% over the last day, indicating growing attacker interest. Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2018-20657

EDB-ID Source Kind Published Link
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2018-20657

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.64% 4.00% +3.36%
2 2026-05-22 0.26% 0.64% +0.38%
3 2025-11-21 — 0.26% —

Full EPSS history (18 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2018-20657

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 3.0 HIGH
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 3.6 [email protected]
5.0 2.0 MEDIUM
AV:N/AC:L/Au:N/C:N/I:N/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 2.9 [email protected]

Weakness enumeration for CVE-2018-20657

OS Trackers for CVE-2018-20657

vendor priority summary link
redhat low — https://access.redhat.com/security/cve/CVE-2018-20657
suse low CVE-2018-20657 severity low: SUSE including 10 source package names (binutils, binutils-devel, …), 67 product×package rows across 24 product lines (SUSE CaaS Platform 4.5, SUSE Enterprise Storage 7, … (24 product lines)): Known Not Affected 63, Fixed 4. https://www.suse.com/security/cve/CVE-2018-20657/
ubuntu negligible CVE-2018-20657 negligible priority: Ubuntu including 1 source packages (binutils), 19 status rows across 19 suites (bionic, cosmic, disco, eoan, focal, groovy, hirsute, impish, jammy, kinetic, lunar, mantic, noble, oracular, plucky, questing, trusty, upstream, xenial): ignored 10, not-affected 6, deferred 3. https://ubuntu.com/security/CVE-2018-20657

Affected software / configurations for CVE-2018-20657

Vendor Product Version Raw CPE
gnu binutils 2.31.1 cpe:2.3:a:gnu:binutils:2.31.1:*:*:*:*:*:*:*
f5 traffix_signaling_delivery_controller >= 5.0.0, <= 5.1.0 cpe:2.3:a:f5:traffix_signaling_delivery_controller:*:*:*:*:*:*:*:*
f5 traffix_signaling_delivery_controller 4.4.0 cpe:2.3:a:f5:traffix_signaling_delivery_controller:4.4.0:*:*:*:*:*:*:*

References for CVE-2018-20657

cvelogic Threat Intelligence