CVE-2020-7060 | global buffer-overflow in mbfl_filt_conv_big5_wchar

Exp

When using certain mbstring functions to convert multibyte encodings, in PHP versions 7.2.x below 7.2.27, 7.3.x below 7.3.14 and 7.4.x below 7.4.2 it is possible to supply data that will cause function mbfl_filt_conv_big5_wchar to read past the allocated buffer. This may lead to information disclosure or crash.

Published: 2020-02-10 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2020-7060 is rated High Exploit Risk (69.9/100): CVSS Medium severity, with high exploitation likelihood (EPSS 6.40%, 91th percentile). 1 public exploit reference(s) are indexed (Exploit-DB). 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-2020-7060

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

Exploit prediction scoring system (EPSS) score for CVE-2020-7060

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 2026-03-04 9.31% 6.40% -2.90%
2 2026-03-01 6.40% 9.31% +2.90%
3 2026-02-19 — 6.40% —

Full EPSS history (58 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2020-7060

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
6.5 3.1 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L 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:L)
Some sensitive info could get out, but not a total data dump.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:L)
Might cause slowdowns, glitches, or partial disruption—not a full brick.
 3.9 2.5 [email protected]
9.1 3.1 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/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:H)
Serious risk that confidential data gets exposed in a big 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 5.2 [email protected]
6.4 2.0 MEDIUM
AV:N/AC:L/Au:N/C:P/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:P)
Partial confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 4.9 [email protected]

Weakness enumeration for CVE-2020-7060

OS Trackers for CVE-2020-7060

vendor priority summary link
alpine critical CVE-2020-7060: 1 source package rows (php7); 1 state rows across 1 repos (edge-community); fixed 1, open 0. https://security.alpinelinux.org/vuln/CVE-2020-7060
debian not yet assigned CVE-2020-7060 not yet assigned priority: Debian including 1 source packages (php7.4), 1 status rows across 1 suites (bullseye): resolved 1. https://security-tracker.debian.org/tracker/CVE-2020-7060
gentoo high CVE-2020-7060: 1 GLSA(s) (202003-57), 1 atom(s) (dev-lang/php); latest impact high. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2020-7060
redhat medium — https://access.redhat.com/security/cve/CVE-2020-7060
suse high CVE-2020-7060 severity important: SUSE including 470 source package names (apache2-mod_php5, apache2-mod_php5-5.5.14-109.68.1, …), 1488 product×package rows across 49 product lines (SLES for SAP Applications 11 SP2, SLES for SAP Applications 11 SP3, … (49 product lines)): Fixed 860, Known Not Affected 628. https://www.suse.com/security/cve/CVE-2020-7060/
ubuntu medium CVE-2020-7060 medium priority: Ubuntu including 4 source packages (php5, php7.0, php7.2, php7.3), 20 status rows across 5 suites (bionic, eoan, trusty, upstream, xenial): DNE 12, released 6, needs-triage 2. https://ubuntu.com/security/CVE-2020-7060

Affected software / configurations for CVE-2020-7060

Vendor Product Version Raw CPE
php php >= 7.2.0, < 7.2.27 cpe:2.3:a:php:php:*:*:*:*:*:*:*:*
php php >= 7.3.0, < 7.3.14 cpe:2.3:a:php:php:*:*:*:*:*:*:*:*
php php >= 7.4.0, < 7.4.2 cpe:2.3:a:php:php:*:*:*:*:*:*:*:*
tenable tenable.sc < 5.19.0 cpe:2.3:a:tenable:tenable.sc:*:*:*:*:*:*:*:*
oracle communications_diameter_signaling_router >= 8.0, <= 8.4 cpe:2.3:a:oracle:communications_diameter_signaling_router:*:*:*:*:*:*:*:*
opensuse leap 15.1 cpe:2.3:o:opensuse:leap:15.1:*:*:*:*:*:*:*
debian debian_linux 8.0 cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*

References for CVE-2020-7060

URL Tags
http://lists.opensuse.org/opensuse-security-announce/2020-03/msg00023.html Mailing List Third Party Advisory
https://bugs.php.net/bug.php?id=79037 Exploit Patch Vendor Advisory
https://lists.debian.org/debian-lts-announce/2020/02/msg00030.html Mailing List Third Party Advisory
https://seclists.org/bugtraq/2020/Feb/27 Mailing List Third Party Advisory
https://seclists.org/bugtraq/2020/Feb/31 Mailing List Third Party Advisory
https://seclists.org/bugtraq/2021/Jan/3 Mailing List Third Party Advisory
https://security.gentoo.org/glsa/202003-57 Third Party Advisory
https://security.netapp.com/advisory/ntap-20200221-0002/ Mailing List Third Party Advisory
https://usn.ubuntu.com/4279-1/ Patch Third Party Advisory
https://www.debian.org/security/2020/dsa-4626 Third Party Advisory
https://www.debian.org/security/2020/dsa-4628 Third Party Advisory
https://www.oracle.com/security-alerts/cpuApr2021.html Third Party Advisory
https://www.oracle.com/security-alerts/cpujul2020.html Third Party Advisory
https://www.tenable.com/security/tns-2021-14 Patch Third Party Advisory
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