CVE-2016-7544

Crypto++ 5.6.4 incorrectly uses Microsoft's stack-based _malloca and _freea functions. The library will request a block of memory to align a table in memory. If the table is later reallocated, then the wrong pointer could be freed.

Published: 2017-01-30 Last update: 2026-05-13 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2016-7544 is rated Moderate Risk (59.8/100): CVSS High severity, with medium exploitation likelihood (EPSS 2.82%). Review affected assets and schedule remediation.

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

Exploit prediction scoring system (EPSS) score for CVE-2016-7544

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 2026-05-13 3.27% 2.82% -0.45%
2 2026-01-01 2.82% 3.27% +0.45%
3 2025-12-25 — 2.82% —

Full EPSS history (29 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2016-7544

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-2016-7544

OS Trackers for CVE-2016-7544

vendor priority summary link
debian unimportant CVE-2016-7544 unimportant priority: Debian including 1 source packages (libcrypto++), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2016-7544
ubuntu low CVE-2016-7544 low priority: Ubuntu including 1 source packages (libcrypto++), 4 status rows across 4 suites (precise, trusty, upstream, xenial): not-affected 4. https://ubuntu.com/security/CVE-2016-7544

Affected software / configurations for CVE-2016-7544

Vendor Product Version Raw CPE
cryptopp crypto\+\+ 5.6.4 cpe:2.3:a:cryptopp:crypto\+\+:5.6.4:*:*:*:*:*:*:*

References for CVE-2016-7544

URL Tags
http://www.openwall.com/lists/oss-security/2016/09/23/5 Mailing List Patch Third Party Advisory
http://www.openwall.com/lists/oss-security/2016/09/23/9 Mailing List Patch Third Party Advisory
http://www.securityfocus.com/bid/93164 Third Party Advisory VDB Entry
https://github.com/weidai11/cryptopp/issues/302 Issue Tracking Patch Third Party Advisory
https://www.cryptopp.com/release565.html Release Notes Vendor Advisory
cvelogic Threat Intelligence