What is CVE-2009-1377?

CVE-2009-1377 is a vulnerability in OpenSSL, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. Published 2009-05-19.

Is CVE-2009-1377 known to be exploited?

2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Buffer overflow in OpenSSL

CVE-2009-1377

The dtls1_buffer_record function in ssl/d1_pkt.c in OpenSSL 0.9.8k and earlier 0.9.8 versions allows remote attackers to cause a denial of service (memory consumption) via a large series of "future epoch" DTLS records that are buffered in a queue, aka "DTLS record buffer limitation bug."

Vulnerability class: Buffer Overflow

Published 2009-05-19 · last modified 2026-06-16.

CVSS v2 metric

CVSS v2 base score 5.0 (Medium). Vector: AV:N/AC:L/Au:N/C:N/I:N/A:P. This CVE predates CVSS v3 and has no v3 score from NVD.

EPSS exploit prediction

EPSS: 0.113 (95.8th percentile), scored 2026-09-28.

Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 96th percentile — 95.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.113 · newest: 0.113 · change: 0.000

Affected products

OpenSSL

Weakness classification (CWE)

CWE-119 — Improper Restriction of Operations within the Bounds of a Memory Buffer

Public proof-of-concept exploits

References

secunia.com/advisories/42724 (Third Party Advisory, third-party-advisory)
rt.openssl.org/Ticket/Display.html (Patch, Mailing List, Third Party Advisory, Broken Link)
slackware.com/security/viewer.php (vendor-advisory, Mailing List, Third Party Advisory)
secunia.com/advisories/38794 (Third Party Advisory, third-party-advisory)
lists.vmware.com/pipermail/security-announce/2010/000082.html (mailing-list, Third Party Advisory)
www.vupen.com/english/advisories/2009/1377 (Permissions Required, Third Party Advisory, vdb-entry)
secunia.com/advisories/35729 (Third Party Advisory, third-party-advisory)
security.gentoo.org/glsa/glsa-200912-01.xml (vendor-advisory, Third Party Advisory)
www.redhat.com/support/errata/RHSA-2009-1335.html (vendor-advisory, Third Party Advisory)
h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp (vendor-advisory, Third Party Advisory, Broken Link)

Frequently asked questions

What is CVE-2009-1377?: CVE-2009-1377 is a vulnerability in OpenSSL, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. Published 2009-05-19.
Is CVE-2009-1377 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.