HIGH
The Intrusion Prevention System (IPS) feature in Cisco IOS 12.3 through 12.4 and 15.0 through 15.2, in certain configurations of enabled categories and missing signatures, allows remote attackers to cause a denial of service (device reload) via DNS packets, aka Bug ID CSCtw55976
Published Sep 27, 2012
7.1
HIGHCVSS 2.0
EPSS 1.55%
Description
The Intrusion Prevention System (IPS) feature in Cisco IOS 12.3 through 12.4 and 15.0 through 15.2, in certain configurations of enabled categories and missing signatures, allows remote attackers to cause a denial of service (device reload) via DNS packets, aka Bug ID CSCtw55976.
Affected products
No data.
AND
OR
- 12.3
- 12.3\(1a\)
- 12.3\(2\)ja
- 12.3\(2\)ja5
- 12.3\(2\)jk
- 12.3\(2\)jk1
- 12.3\(2\)t3
- 12.3\(2\)t8
- 12.3\(2\)xa4
- 12.3\(2\)xa5
- 12.3\(2\)xc1
- 12.3\(2\)xc2
- 12.3\(2\)xc3
- 12.3\(2\)xc4
- 12.3\(2\)xe3
- 12.3\(2\)xe4
- 12.3\(3e\)
- 12.3\(3h\)
- 12.3\(3i\)
- 12.3\(4\)eo1
- 12.3\(4\)ja
- 12.3\(4\)ja1
- 12.3\(4\)t
- 12.3\(4\)t1
- 12.3\(4\)t2
- 12.3\(4\)t3
- 12.3\(4\)t4
- 12.3\(4\)t8
- 12.3\(4\)tpc11a
- 12.3\(4\)xd
- 12.3\(4\)xd1
- 12.3\(4\)xd2
- 12.3\(4\)xe4
- 12.3\(4\)xg1
- 12.3\(4\)xg2
- 12.3\(4\)xg4
- 12.3\(4\)xg5
- 12.3\(4\)xh
- 12.3\(4\)xk
- 12.3\(4\)xk1
- 12.3\(4\)xk3
- 12.3\(4\)xk4
- 12.3\(4\)xq
- 12.3\(4\)xq1
- 12.3\(5\)
- 12.3\(5\)b1
- 12.3\(5a\)
- 12.3\(5a\)b
- 12.3\(5a\)b2
- 12.3\(5a\)b5
- 12.3\(5b\)
- 12.3\(5c\)
- 12.3\(5e\)
- 12.3\(5f\)
- 12.3\(6\)
- 12.3\(6a\)
- 12.3\(6d\)
- 12.3\(6e\)
- 12.3\(6f\)
- 12.3\(7\)ja
- 12.3\(7\)ja1
- 12.3\(7\)jx
- 12.3\(7\)t
- 12.3\(7\)t4
- 12.3\(7\)t8
- 12.3\(7\)t9
- 12.3\(7\)t10
- 12.3\(7\)t12
- 12.3\(7\)xi3
- 12.3\(7\)xi4
- 12.3\(7\)xi7
- 12.3\(7\)xr3
- 12.3\(7\)xr4
- 12.3\(7\)xr6
- 12.3\(7.7\)
- 12.3\(8\)ja
- 12.3\(8\)ja1
- 12.3\(8\)t4
- 12.3\(8\)t7
- 12.3\(8\)t8
- 12.3\(8\)t9
- 12.3\(8\)t11
- 12.3\(8\)xu2
- 12.3\(8\)xy4
- 12.3\(8\)xy5
- 12.3\(8\)xy6
- 12.3\(8\)ya1
- 12.3\(8\)yd
- 12.3\(8\)yf
- 12.3\(8\)yg
- 12.3\(8\)yg1
- 12.3\(8\)yg2
- 12.3\(8\)yg3
- 12.3\(8\)yh
- 12.3\(8\)yi
- 12.3\(8\)yi1
- 12.3\(8\)yi3
- 12.3\(9\)
- 12.3\(9a\)bc
- 12.3\(9a\)bc2
- 12.3\(9a\)bc6
- 12.3\(9a\)bc7
- 12.3\(9d\)
- 12.3\(9e\)
- 12.3\(10\)
- 12.3\(10c\)
- 12.3\(10d\)
- 12.3\(10e\)
- 12.3\(11\)
- 12.3\(11\)t
- 12.3\(11\)t4
- 12.3\(11\)t5
- 12.3\(11\)t6
- 12.3\(11\)t8
- 12.3\(11\)t9
- 12.3\(11\)xl
- 12.3\(11\)xl3
- 12.3\(11\)yf
- 12.3\(11\)yf2
- 12.3\(11\)yf3
- 12.3\(11\)yf4
- 12.3\(11\)yj
- 12.3\(11\)yk
- 12.3\(11\)yk1
- 12.3\(11\)yk2
- 12.3\(11\)yl
- 12.3\(11\)yn
- 12.3\(11\)yr
- 12.3\(11\)ys
- 12.3\(11\)ys1
- 12.3\(11\)yw
- 12.3\(12\)
- 12.3\(12b\)
- 12.3\(12e\)
- 12.3\(13\)
- 12.3\(13a\)
- 12.3\(13a\)bc
- 12.3\(13a\)bc1
- 12.3\(13b\)
- 12.3\(14\)t
- 12.3\(14\)t2
- 12.3\(14\)t4
- 12.3\(14\)t5
- 12.3\(14\)ym4
- 12.3\(14\)yq
- 12.3\(14\)yq1
- 12.3\(14\)yq3
- 12.3\(14\)yq4
- 12.3\(14\)yt
- 12.3\(14\)yt1
- 12.3\(14\)yu
- 12.3\(14\)yu1
- 12.3\(15\)
- 12.3\(15b\)
- 12.3\(16\)
- 12.3b
- 12.3bc
- 12.3bw
- 12.3j
- 12.3ja
- 12.3jea
- 12.3jeb
- 12.3jec
- 12.3jed
- 12.3jk
- 12.3jl
- 12.3jx
- 12.3t
- 12.3tpc
- 12.3va
- 12.3xa
- 12.3xb
- 12.3xc
- 12.3xd
- 12.3xe
- 12.3xf
- 12.3xg
- 12.3xh
- 12.3xi
- 12.3xj
- 12.3xk
- 12.3xl
- 12.3xm
- 12.3xn
- 12.3xq
- 12.3xr
- 12.3xs
- 12.3xt
- 12.3xu
- 12.3xv
- 12.3xw
- 12.3xx
- 12.3xy
- 12.3xz
- 12.3ya
- 12.3yb
- 12.3yc
- 12.3yd
- 12.3ye
- 12.3yf
- 12.3yg
- 12.3yh
- 12.3yi
- 12.3yj
- 12.3yk
- 12.3yl
- 12.3ym
- 12.3yn
- 12.3yq
- 12.3yr
- 12.3ys
- 12.3yt
- 12.3yu
- 12.3yw
- 12.3yx
- 12.3yz
- 12.3za
- 12.4
- 12.4\(1\)
- 12.4\(1b\)
- 12.4\(1c\)
- 12.4\(2\)mr
- 12.4\(2\)mr1
- 12.4\(2\)t
- 12.4\(2\)t1
- 12.4\(2\)t2
- 12.4\(2\)t3
- 12.4\(2\)t4
- 12.4\(2\)xa
- 12.4\(2\)xb
- 12.4\(2\)xb2
- 12.4\(3\)
- 12.4\(3\)t2
- 12.4\(3a\)
- 12.4\(3b\)
- 12.4\(3d\)
- 12.4\(4\)mr
- 12.4\(4\)t
- 12.4\(4\)t2
- 12.4\(5\)
- 12.4\(5b\)
- 12.4\(6\)t
- 12.4\(6\)t1
- 12.4\(7\)
- 12.4\(7a\)
- 12.4\(8\)
- 12.4\(9\)t
- 12.4\(11\)md
- 12.4\(15\)md
- 12.4\(22\)md
- 12.4\(22\)mda
- 12.4\(23\)
- 12.4\(24\)md
- 12.4\(24\)md1
- 12.4\(24\)md2
- 12.4\(24\)md3
- 12.4\(24\)md4
- 12.4\(24\)mda
- 12.4\(24\)t1
- 12.4gc
- 12.4ja
- 12.4jda
- 12.4jdc
- 12.4jdd
- 12.4jk
- 12.4jl
- 12.4jma
- 12.4jmb
- 12.4jx
- 12.4md
- 12.4mda
- 12.4mdb
- 12.4mr
- 12.4mra
- 12.4xp
- 12.4xq
- 12.4xr
- 12.4xt
- 12.4xv
- 12.4xw
- 12.4xy
- 12.4xz
- 12.4ya
- 12.4yb
- 12.4yd
- 12.4ye
- 12.4yg
- 15.0
- 15.0\(1\)se
- 15.1
- 15.2
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
No CVSS v3.0 score for this CVE.
7.1 HIGH NVD
AV:N/AC:M/Au:N/C:N/I:N/A:C
Access Vector Network
Access Complexity Medium
Authentication None
Confidentiality Impact None
Integrity Impact None
Availability Impact Complete
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
1.55% 0.01548
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
EPSS probability 0.01548
Score over time
2022–2026- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (10 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 1.55% (0.01548) | 74.13th | v5 (v2026.06.15) |
| Jun 15, 2026 | 1.55% (0.01548) | 71.72th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.66% (0.00662) | 69.44th | v4 (v2025.03.14) |
| Dec 12, 2024 | 1.28% (0.01282) | 86.34th | v3 (v2023.03.01) |
| May 3, 2024 | 1.28% (0.01282) | 85.65th | v3 (v2023.03.01) |
| Mar 7, 2023 | 1.28% (0.01282) | 83.63th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.21% (0.01213) | 66.61th | v2 (v2022.01.01) |
| Feb 17, 2023 | 1.21% (0.01213) | 66.22th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.21% (0.01213) | 64.21th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.21% (0.01213) | 40.54th | v2 (v2022.01.01) |
Weaknesses (1)
References (5)
- http://secunia.com/advisories/50777 third-party-advisoryx_refsource_SECUNIA
- http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20120926-ios-ips vendor-advisoryx_refsource_CISCOVendor Advisory
- http://www.securityfocus.com/bid/55695 vdb-entryx_refsource_BID
- http://www.securitytracker.com/id?1027580 vdb-entryx_refsource_SECTRACK
- https://exchange.xforce.ibmcloud.com/vulnerabilities/78882 vdb-entryx_refsource_XF
| Link | Providers | Tags |
|---|---|---|
| http://secunia.com/advisories/50777 | third-party-advisoryx_refsource_SECUNIA | |
| http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20120926-ios-ips | vendor-advisoryx_refsource_CISCOVendor Advisory | |
| http://www.securityfocus.com/bid/55695 | vdb-entryx_refsource_BID | |
| http://www.securitytracker.com/id?1027580 | vdb-entryx_refsource_SECTRACK | |
| https://exchange.xforce.ibmcloud.com/vulnerabilities/78882 | vdb-entryx_refsource_XF |
Change history (0)
No recorded changes yet.
Sources
CVE.org / MITRE
Status PUBLISHED
Assigner cisco
Published Sep 27, 2012
Updated Aug 6, 2024
Reserved Jul 10, 2012
Link CVE-2012-3950
CISA Vulnrichment
Updated n/a