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CVE-2013-7372

19
FAUCET Score

CVE-2013-7372 describes a vulnerability in the SecureRandom implementation of Apache Harmony, specifically in the engineNextBytes function, affecting Android versions prior to 4.4 and other products utilizing Apache Harmony through 6.0M3. When a user-provided seed is absent, an incorrect offset value leads to predictable pseudo-random number generation (PRNG). This flaw has a CVSS score of 5.0 (Medium) with a network attack vector and low attack complexity, allowing attackers to more easily defeat cryptographic protections, as demonstrated by its exploitation against Bitcoin wallet applications in August 2013. Despite its historical exploitation, there is no current evidence of active exploitation, publicly available exploit code in Metasploit, Nuclei, or ExploitDB, and minimal community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
<= 6.0CPE matchmatch criteria
cpe:2.3:a:apache:harmony:*:m3:*:*:*:*:*:*
<= 4.3.1CPE matchmatch criteria
cpe:2.3:o:google:android:*:*:*:*:*:*:*:*
4.0CPE matchmatch criteria
cpe:2.3:o:google:android:4.0:*:*:*:*:*:*:*
4.0.1CPE matchmatch criteria
cpe:2.3:o:google:android:4.0.1:*:*:*:*:*:*:*
4.0.2CPE matchmatch criteria
cpe:2.3:o:google:android:4.0.2:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

5.0MEDIUM

AV:N/AC:L/Au:N/C:N/I:P/A:N

Confidentiality Impact
NONE
Integrity Impact
PARTIAL
Availability Impact
NONE
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Exploitability Score
10.0
Impact Score
2.9
CvssVersion
2.0

Exploit Intelligence

EPSS Score
2.34%
Probability of exploitation in next 30 days
EPSS Percentile
81.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0234 is in the 72nd percentile among its peer group of 23,701 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

android-developers.blogspot.com.au / 2013/08/some-securerandom-thoughts.html
Patch
android.googlesource.com / platform/libcore/+/kitkat-release/luni/src/main/java/org/apache/harmony/security/provider/crypto/SHA1PRNG_SecureRandomImpl.java
Patch
bitcoin.org / en/alert/2013-08-11-android
nds.rub.de / media/nds/veroeffentlichungen/2013/03/25/paper_2.pdf
Exploit