Out-of-bounds Read in Apache Portable Runtime
CVE-2021-35940
An out-of-bounds array read in the apr_time_exp*() functions was fixed in the Apache Portable Runtime 1.6.3 release (CVE-2017-12613). The fix for this issue was not carried forward to the APR 1.7.x branch, and hence version 1.7.0 regressed compared to 1.6.3 and is vulnerable to the same issue.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.1 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H.
EPSS exploit prediction
EPSS: 0.012 (66.6th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 67th percentile — 66.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.012 · newest: 0.012 · change: 0.000
Affected products
- Apache Portable Runtime — versions 1.7.0
- Apache Software Foundation Portable Runtime (Apr) — versions Apache Portable Runtime 1.7.0
- Oracle HTTP Server — versions 12.2.1.3.0, 12.2.1.4.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- svn.apache.org/viewvc (Vendor Advisory)
- mail-archives.apache.org/mod_mbox/www-announce/201710.mbox/<CACsi251B8UaLvM-rrH…
- dist.apache.org/repos/dist/release/apr/patches/apr-1.7.0-CVE-2021-35940.patch (Patch, Vendor Advisory)
- lists.apache.org/thread.html/ra2868b53339a6af65577146ad87016368c138388b09bff9d2… (Mailing List, Vendor Advisory)
- www.openwall.com/lists/oss-security/2021/08/23/1 (mailing-list, Mailing List, Third Party Advisory)
- lists.apache.org/thread.html/rb1f3c85f50fbd924a0051675118d1609e57957a02ece7facb… (mailing-list)
- lists.apache.org/thread.html/r7bb4a6ed88fc48152174e664aae30ea9a8b058eb5b44cf08c… (mailing-list)
- lists.apache.org/thread.html/r7bb4a6ed88fc48152174e664aae30ea9a8b058eb5b44cf08c… (mailing-list)
- lists.apache.org/thread.html/r72a069753b9363c29732e59ad8f0d22a633fb6a6999804075… (mailing-list)
- lists.apache.org/thread.html/r317c398ee5736e627f7887b06607e5c58b45a696d352ba8c1… (mailing-list)
Frequently asked questions
- What is CVE-2021-35940?
- CVE-2021-35940 is a high-severity vulnerability in Apache Portable Runtime, classified under Out-of-bounds Read. CVSS score: 7.1/10. Published 2021-08-23.
- How severe is CVE-2021-35940?
- High severity. CVSS v3 base score is 7.1 out of 10.
- Is CVE-2021-35940 known to be exploited?
- 6 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.