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CVE-2011-1473

53
FAUCET Score

CVE-2011-1473 describes a denial-of-service vulnerability in OpenSSL versions before 0.9.8l and 0.9.8m through 1.x. This flaw allows remote attackers to consume excessive CPU resources by repeatedly initiating renegotiations within a single SSL/TLS connection. With a CVSS score of 5.0 (medium severity), it is easily exploitable over the network with low attack complexity, leading to a partial availability impact. There is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
0.9.8mCPE matchmatch criteria
cpe:2.3:a:openssl:openssl:0.9.8m:*:*:*:*:*:*:*
0.9.8mCPE matchmatch criteria
cpe:2.3:a:openssl:openssl:0.9.8m:beta1:*:*:*:*:*:*
0.9.8nCPE matchmatch criteria
cpe:2.3:a:openssl:openssl:0.9.8n:*:*:*:*:*:*:*
0.9.8oCPE matchmatch criteria
cpe:2.3:a:openssl:openssl:0.9.8o:*:*:*:*:*:*:*
0.9.8pCPE matchmatch criteria
cpe:2.3:a:openssl:openssl:0.9.8p:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

5.0MEDIUM

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

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

Exploit Intelligence

EPSS Score
66.42%
Probability of exploitation in next 30 days
EPSS Percentile
99.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.6642 is in the 99th percentile among its peer group of 23,705 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

Vendor Patches (6)

redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 4Fixed in: openssl
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 4Fixed in: openssl096b
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: openssl
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: openssl097a
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: openssl
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: openssl098e

Vendor Advisories (1)

redhatCVE-2011-1473Low

openssl: DoS via repeated SSL session renegotiations

Mar 13, 2011

References

archives.neohapsis.com / archives/bugtraq/2014-02/0061.html
marc.info
orchilles.com / 2011/03/ssl-renegotiation-dos.html
bugzilla.redhat.com / show_bug.cgi
lists.apache.org / thread.html/142b93d261e8ac7c5ceffdce848d622404abc1c286bbc999f43a9e10%40%3Cdev.rocketmq.apache.org%3E
lists.apache.org / thread.html/6121becfdd23f9aeb675d5db80616536277d5931d6cde9dca292e509%40%3Cdev.rocketmq.apache.org%3E
lists.apache.org / thread.html/8be38d35654441140db8eb3f7433524b3653ac3fdc26e2fa94626a3a%40%3Cdev.rocketmq.apache.org%3E
lists.apache.org / thread.html/r13a07a09f98b2841193dbf17a47c7f09b464e0747a1d3e7298ad4c81%40%3Cdev.rocketmq.apache.org%3E
lists.apache.org / thread.html/r1e33410bb5c81536e7fe14b51fa83e7bfd9445db61fd10c134792bde%40%3Cdev.rocketmq.apache.org%3E
lists.apache.org / thread.html/r298a09a2b98446b27217d719e877c643b6d13fac0bcafe04696a446b%40%3Cdev.rocketmq.apache.org%3E
lists.apache.org / thread.html/r3822ad69442291562c2ab41132fc49780d269e8b52deb458b7060f6d%40%3Ccommits.rocketmq.apache.org%3E
lists.apache.org / thread.html/r5e595b91f00613dafa635852121d45b161e8b5c3eba4551aeccc6483%40%3Cdev.rocketmq.apache.org%3E
lists.apache.org / thread.html/r77fe575893261889b983e067293be72fa1f8c6305ede9fdbc404c514%40%3Cdev.rocketmq.apache.org%3E
lists.apache.org / thread.html/r8680f41bcdad13c3f267cb868b45e5fb1f57df8b39d25193f7d66500%40%3Cdev.rocketmq.apache.org%3E
lists.apache.org / thread.html/ra95c355827b3c96c8013ed8e0666c851581651be2524f3d28cd4fe71%40%3Cdev.rocketmq.apache.org%3E
lists.apache.org / thread.html/rc98eaa3f8223ac75aa5969f717954d8cbc9f3a9d8b7a6156a54fa557%40%3Cdev.rocketmq.apache.org%3E
lists.apache.org / thread.html/rf9e8ae0356af3ec4f7780ca651b770721d287d4d55f62f4f754e0a6f%40%3Cdev.rocketmq.apache.org%3E
vincent.bernat.im / en/blog/2011-ssl-dos-mitigation.html
educatedguesswork.org / 2011/10/ssltls_and_computational_dos.html
ietf.org / mail-archive/web/tls/current/msg07553.html
ietf.org / mail-archive/web/tls/current/msg07564.html
ietf.org / mail-archive/web/tls/current/msg07567.html
ietf.org / mail-archive/web/tls/current/msg07576.html
ietf.org / mail-archive/web/tls/current/msg07577.html
openwall.com / lists/oss-security/2011/07/08/2