CVE-2023-20109

Cisco — Cisco IOS and IOS XE Group Encrypted Transport VPN Out-of-Bounds Write Vulnerability

Cisco · CWE-787 — Out-of-bounds write · in CISA KEV since 2023-10-10

KEV since 2023 · listed over a yearCISA KEVActively Exploited

EVRS 75 of 100 Urgent

Patch This Cycle

Rank 1,213 of 2,960 tracked

Raised to the floor for a confirmed exploited vulnerability.

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Why it scores 75

Evidence available: 6 of 7 signals

Listed in the CISA KEV catalog, and an EPSS probability of 0.025.

CISA KEVApplied
RansomwareDid not apply
Vendor exploitationDid not apply
EPSSApplied
Microsoft Exploitability IndexNot applicable
Pre-patch disclosureNo data
KEV recencyDid not apply
CVSSApplied

The band answers “how soon”, not “how bad”. No data for: Pre-patch disclosure. Why some signals show no data

Fix

No fixed version identified yet

CISA required action

Affected versions

ios12.4\(22\)md12.4\(22\)md112.4\(22\)md212.4\(22\)mda12.4\(22\)mda112.4\(22\)mda212.4\(22\)mda312.4\(22\)mda412.4\(22\)mda512.4\(22\)mda612.4\(22\)t12.4\(22\)t112.4\(22\)t212.4\(22\)t312.4\(22\)t412.4\(22\)t512.4\(22\)xr112.4\(22\)xr212.4\(22\)xr312.4\(22\)xr412.4\(22\)xr512.4\(22\)xr612.4\(22\)xr712.4\(22\)xr812.4\(22\)xr912.4\(22\)xr1012.4\(22\)xr1112.4\(22\)xr1212.4\(24\)md12.4\(24\)md112.4\(24\)md212.4\(24\)md312.4\(24\)md412.4\(24\)md512.4\(24\)md612.4\(24\)md712.4\(24\)mda112.4\(24\)mda212.4\(24\)mda312.4\(24\)mda412.4\(24\)mda512.4\(24\)mda612.4\(24\)mda712.4\(24\)mda812.4\(24\)mda912.4\(24\)mda1012.4\(24\)mda1112.4\(24\)mda1212.4\(24\)mda1312.4\(24\)mdb12.4\(24\)mdb112.4\(24\)mdb312.4\(24\)mdb412.4\(24\)mdb512.4\(24\)mdb5a12.4\(24\)mdb612.4\(24\)mdb712.4\(24\)mdb812.4\(24\)mdb912.4\(24\)mdb1012.4\(24\)mdb1112.4\(24\)mdb1212.4\(24\)mdb1312.4\(24\)mdb1412.4\(24\)mdb1512.4\(24\)mdb1612.4\(24\)mdb1712.4\(24\)mdb1812.4\(24\)mdb1912.4\(24\)t12.4\(24\)t112.4\(24\)t212.4\(24\)t312.4\(24\)t3e12.4\(24\)t3f12.4\(24\)t412.4\(24\)t4a12.4\(24\)t4b12.4\(24\)t4c12.4\(24\)t4d12.4\(24\)t4e12.4\(24\)t4f12.4\(24\)t4l12.4\(24\)t512.4\(24\)t612.4\(24\)t712.4\(24\)t812.4\(24\)yg12.4\(24\)yg112.4\(24\)yg212.4\(24\)yg312.4\(24\)yg415.0\(1\)m15.0\(1\)m115.0\(1\)m215.0\(1\)m315.0\(1\)m415.0\(1\)m515.0\(1\)m615.0\(1\)m715.0\(1\)m815.0\(1\)m915.0\(1\)m1015.0\(1\)mr15.0\(1\)s15.0\(1\)s115.0\(1\)s215.0\(1\)s3a15.0\(1\)s415.0\(1\)s4a15.0\(1\)s515.0\(1\)s615.0\(1\)xa15.0\(1\)xa115.0\(1\)xa215.0\(1\)xa315.0\(1\)xa415.0\(1\)xa515.0\(2\)ea15.0\(2\)ea115.0\(2\)ej15.0\(2\)ej115.0\(2\)ek15.0\(2\)ek115.0\(2\)ex15.0\(2\)ex115.0\(2\)ex215.0\(2\)ex315.0\(2\)ex415.0\(2\)ex515.0\(2\)ex815.0\(2\)ex1015.0\(2\)ex1115.0\(2\)ex1215.0\(2\)ex1315.0\(2\)ey15.0\(2\)ey115.0\(2\)ey215.0\(2\)ey315.0\(2\)ez15.0\(2\)mr15.0\(2\)se15.0\(2\)se115.0\(2\)se215.0\(2\)se315.0\(2\)se415.0\(2\)se515.0\(2\)se615.0\(2\)se715.0\(2\)se815.0\(2\)se915.0\(2\)se1015.0\(2\)se10a15.0\(2\)se1115.0\(2\)se1215.0\(2\)se1315.0\(2a\)ex515.1\(1\)s15.1\(1\)s115.1\(1\)s215.1\(1\)sg15.1\(1\)sg115.1\(1\)sg215.1\(1\)sy15.1\(1\)sy115.1\(1\)sy215.1\(1\)sy315.1\(1\)sy415.1\(1\)sy515.1\(1\)sy615.1\(1\)t15.1\(1\)t115.1\(1\)t215.1\(1\)t315.1\(1\)t415.1\(1\)t515.1\(1\)xb15.1\(2\)gc15.1\(2\)gc115.1\(2\)gc215.1\(2\)s15.1\(2\)s115.1\(2\)s215.1\(2\)sg15.1\(2\)sg115.1\(2\)sg215.1\(2\)sg315.1\(2\)sg415.1\(2\)sg515.1\(2\)sg615.1\(2\)sg715.1\(2\)sg815.1\(2\)sy15.1\(2\)sy115.1\(2\)sy215.1\(2\)sy315.1\(2\)sy415.1\(2\)sy4a15.1\(2\)sy515.1\(2\)sy615.1\(2\)sy715.1\(2\)sy815.1\(2\)sy915.1\(2\)sy1015.1\(2\)sy1115.1\(2\)sy1215.1\(2\)sy1315.1\(2\)sy1415.1\(2\)sy1515.1\(2\)sy1615.1\(2\)t15.1\(2\)t0a15.1\(2\)t115.1\(2\)t215.1\(2\)t2a15.1\(2\)t315.1\(2\)t415.1\(2\)t515.1\(3\)mra15.1\(3\)mra115.1\(3\)mra215.1\(3\)mra315.1\(3\)mra415.1\(3\)s15.1\(3\)s0a15.1\(3\)s115.1\(3\)s215.1\(3\)s315.1\(3\)s415.1\(3\)s515.1\(3\)s5a15.1\(3\)s615.1\(3\)svb115.1\(3\)svb215.1\(3\)svd15.1\(3\)svd115.1\(3\)svd215.1\(3\)sve15.1\(3\)svf15.1\(3\)svf115.1\(3\)svg15.1\(3\)svj215.1\(3\)t15.1\(3\)t115.1\(3\)t215.1\(3\)t315.1\(3\)t415.1\(4\)gc15.1\(4\)gc115.1\(4\)gc215.1\(4\)m15.1\(4\)m115.1\(4\)m215.1\(4\)m315.1\(4\)m3a15.1\(4\)m415.1\(4\)m515.1\(4\)m615.1\(4\)m715.1\(4\)m815.1\(4\)m915.1\(4\)m1015.2\(1\)e15.2\(1\)e115.2\(1\)e215.2\(1\)e315.2\(1\)ey15.2\(1\)gc15.2\(1\)gc115.2\(1\)gc215.2\(1\)s15.2\(1\)s115.2\(1\)s215.2\(1\)sy15.2\(1\)sy0a15.2\(1\)sy115.2\(1\)sy1a15.2\(1\)sy215.2\(1\)sy315.2\(1\)sy415.2\(1\)sy515.2\(1\)sy615.2\(1\)sy715.2\(1\)sy815.2\(2\)e15.2\(2\)e115.2\(2\)e215.2\(2\)e315.2\(2\)e415.2\(2\)e515.2\(2\)e5a15.2\(2\)e5b15.2\(2\)e615.2\(2\)e715.2\(2\)e7b15.2\(2\)e815.2\(2\)e915.2\(2\)e1015.2\(2\)ea15.2\(2\)ea115.2\(2\)ea215.2\(2\)ea315.2\(2\)eb15.2\(2\)eb115.2\(2\)eb215.2\(2\)gc15.2\(2\)s15.2\(2\)s0a15.2\(2\)s0c15.2\(2\)s115.2\(2\)s215.2\(2\)sy15.2\(2\)sy115.2\(2\)sy215.2\(2\)sy315.2\(2a\)e115.2\(2a\)e215.2\(3\)e15.2\(3\)e115.2\(3\)e215.2\(3\)e315.2\(3\)e415.2\(3\)e515.2\(3\)ea15.2\(3\)gc15.2\(3\)gc115.2\(3a\)e15.2\(4\)e15.2\(4\)e115.2\(4\)e215.2\(4\)e315.2\(4\)e415.2\(4\)e515.2\(4\)e5a15.2\(4\)e615.2\(4\)e715.2\(4\)e815.2\(4\)e915.2\(4\)e1015.2\(4\)e10a15.2\(4\)e10d15.2\(4\)ea15.2\(4\)ea115.2\(4\)ea315.2\(4\)ea415.2\(4\)ea515.2\(4\)ea615.2\(4\)ea715.2\(4\)ea815.2\(4\)ea915.2\(4\)ea9a15.2\(4\)ec115.2\(4\)ec215.2\(4\)gc15.2\(4\)gc115.2\(4\)gc215.2\(4\)gc315.2\(4\)m15.2\(4\)m115.2\(4\)m215.2\(4\)m315.2\(4\)m415.2\(4\)m515.2\(4\)m615.2\(4\)m6a15.2\(4\)m715.2\(4\)m815.2\(4\)m915.2\(4\)m1015.2\(4\)m1115.2\(4\)s15.2\(4\)s115.2\(4\)s215.2\(4\)s315.2\(4\)s3a15.2\(4\)s415.2\(4\)s4a15.2\(4\)s515.2\(4\)s615.2\(4\)s715.2\(5\)e15.2\(5\)e115.2\(5\)e215.2\(5\)e2b15.2\(5\)e2c15.2\(5\)ea15.2\(5\)ex15.2\(5a\)e15.2\(5a\)e115.2\(5b\)e15.2\(5c\)e15.2\(6\)e15.2\(6\)e0a15.2\(6\)e0c15.2\(6\)e115.2\(6\)e215.2\(6\)e2a15.2\(6\)e2b15.2\(6\)e315.2\(6\)eb15.2\(7\)e15.2\(7\)e0a15.2\(7\)e0b15.2\(7\)e0s15.2\(7\)e115.2\(7\)e1a15.2\(7\)e215.2\(7\)e2a15.2\(7\)e315.2\(7\)e3k15.2\(7\)e415.2\(7\)e515.2\(7\)e615.2\(7\)e715.2\(7\)e815.2\(7a\)e0b15.2\(7b\)e0b15.2\(8\)e15.2\(8\)e115.2\(8\)e215.2\(8\)e315.2\(8\)e415.3\(1\)s15.3\(1\)s115.3\(1\)s215.3\(1\)sy15.3\(1\)sy115.3\(1\)sy215.3\(1\)t15.3\(1\)t115.3\(1\)t215.3\(1\)t315.3\(1\)t415.3\(2\)s15.3\(2\)s115.3\(2\)s215.3\(2\)t15.3\(2\)t115.3\(2\)t215.3\(2\)t315.3\(2\)t415.3\(3\)m15.3\(3\)m115.3\(3\)m215.3\(3\)m315.3\(3\)m415.3\(3\)m515.3\(3\)m615.3\(3\)m715.3\(3\)m815.3\(3\)m8a15.3\(3\)m915.3\(3\)m1015.3\(3\)s15.3\(3\)s115.3\(3\)s1a15.3\(3\)s215.3\(3\)s315.3\(3\)s415.3\(3\)s515.3\(3\)s615.3\(3\)s715.3\(3\)s815.3\(3\)s8a15.3\(3\)s915.3\(3\)s1015.4\(1\)cg15.4\(1\)cg115.4\(1\)s15.4\(1\)s115.4\(1\)s215.4\(1\)s315.4\(1\)s415.4\(1\)sy15.4\(1\)sy115.4\(1\)sy215.4\(1\)sy315.4\(1\)sy415.4\(1\)t15.4\(1\)t115.4\(1\)t215.4\(1\)t315.4\(1\)t415.4\(2\)cg15.4\(2\)s15.4\(2\)s115.4\(2\)s215.4\(2\)s315.4\(2\)s415.4\(2\)t15.4\(2\)t115.4\(2\)t215.4\(2\)t315.4\(2\)t415.4\(3\)m15.4\(3\)m115.4\(3\)m215.4\(3\)m315.4\(3\)m415.4\(3\)m515.4\(3\)m615.4\(3\)m6a15.4\(3\)m715.4\(3\)m815.4\(3\)m915.4\(3\)m1015.4\(3\)s15.4\(3\)s115.4\(3\)s215.4\(3\)s315.4\(3\)s415.4\(3\)s515.4\(3\)s615.4\(3\)s6a15.4\(3\)s715.4\(3\)s815.4\(3\)s915.4\(3\)s1015.5\(1\)s15.5\(1\)s115.5\(1\)s215.5\(1\)s315.5\(1\)s415.5\(1\)sy15.5\(1\)sy115.5\(1\)sy215.5\(1\)sy315.5\(1\)sy415.5\(1\)sy515.5\(1\)sy615.5\(1\)sy715.5\(1\)sy815.5\(1\)sy915.5\(1\)sy1015.5\(1\)sy1115.5\(1\)t15.5\(1\)t115.5\(1\)t215.5\(1\)t315.5\(1\)t415.5\(2\)s15.5\(2\)s115.5\(2\)s215.5\(2\)s315.5\(2\)s415.5\(2\)t15.5\(2\)t115.5\(2\)t215.5\(2\)t315.5\(2\)t415.5\(3\)m15.5\(3\)m0a15.5\(3\)m115.5\(3\)m215.5\(3\)m315.5\(3\)m415.5\(3\)m4a15.5\(3\)m515.5\(3\)m615.5\(3\)m6a15.5\(3\)m715.5\(3\)m815.5\(3\)m915.5\(3\)m1015.5\(3\)s15.5\(3\)s0a15.5\(3\)s115.5\(3\)s1a15.5\(3\)s215.5\(3\)s315.5\(3\)s415.5\(3\)s515.5\(3\)s615.5\(3\)s6a15.5\(3\)s6b15.5\(3\)s715.5\(3\)s815.5\(3\)s915.5\(3\)s9a15.5\(3\)s1015.5\(3\)sn15.6\(1\)s15.6\(1\)s115.6\(1\)s215.6\(1\)s315.6\(1\)s415.6\(1\)t15.6\(1\)t0a15.6\(1\)t115.6\(1\)t215.6\(1\)t315.6\(2\)s15.6\(2\)s115.6\(2\)s215.6\(2\)s315.6\(2\)s415.6\(2\)sn15.6\(2\)sp15.6\(2\)sp115.6\(2\)sp215.6\(2\)sp315.6\(2\)sp415.6\(2\)sp515.6\(2\)sp615.6\(2\)sp715.6\(2\)sp815.6\(2\)sp915.6\(2\)sp1015.6\(2\)t15.6\(2\)t115.6\(2\)t215.6\(2\)t315.6\(3\)m15.6\(3\)m0a15.6\(3\)m115.6\(3\)m1b15.6\(3\)m215.6\(3\)m2a15.6\(3\)m315.6\(3\)m3a15.6\(3\)m415.6\(3\)m515.6\(3\)m615.6\(3\)m6a15.6\(3\)m6b15.6\(3\)m715.6\(3\)m815.6\(3\)m915.7\(3\)m15.7\(3\)m0a15.7\(3\)m115.7\(3\)m215.7\(3\)m315.7\(3\)m415.7\(3\)m4a15.7\(3\)m4b15.7\(3\)m515.7\(3\)m615.7\(3\)m715.7\(3\)m815.7\(3\)m915.8\(3\)m15.8\(3\)m0a15.8\(3\)m0b15.8\(3\)m115.8\(3\)m1a15.8\(3\)m215.8\(3\)m2a15.8\(3\)m315.8\(3\)m3a15.8\(3\)m3b15.8\(3\)m415.8\(3\)m515.8\(3\)m615.8\(3\)m715.8\(3\)m815.8\(3\)m915.8\(3\)m1015.9\(3\)m15.9\(3\)m0a15.9\(3\)m115.9\(3\)m215.9\(3\)m2a15.9\(3\)m315.9\(3\)m3a15.9\(3\)m3b15.9\(3\)m415.9\(3\)m4a15.9\(3\)m515.9\(3\)m615.9\(3\)m6a15.9\(3\)m6b15.9\(3\)m715.9\(3\)m7a
ios xe3.3.0sg3.3.1sg3.3.2sg3.4.0sg3.4.1sg3.4.2sg3.4.3sg3.4.4sg3.4.5sg3.4.6sg3.4.7sg3.4.8sg3.5.0e3.5.1e3.5.2e3.5.3e3.6.0e3.6.1e3.6.2ae3.6.2e3.6.3e3.6.4e3.6.5ae3.6.5be3.6.5e3.6.6e3.6.7be3.6.7e3.6.8e3.6.9e3.6.10e3.7.0bs3.7.0s3.7.1as3.7.1s3.7.2s3.7.2ts3.7.3s3.7.4as3.7.4s3.7.5s3.7.6s3.7.7s3.8.0e3.8.0s3.8.1e3.8.1s3.8.2e3.8.2s3.8.3e3.8.4e3.8.5ae3.8.5e3.8.6e3.8.7e3.8.8e3.8.9e3.8.10e3.9.0as3.9.0e3.9.0s3.9.1as3.9.1e3.9.1s3.9.2e3.9.2s3.10.0ce3.10.0e3.10.0s3.10.1e3.10.1s3.10.1xbs3.10.2e3.10.2s3.10.2ts3.10.3e3.10.3s3.10.4s3.10.5s3.10.6s3.10.7s3.10.8as3.10.8s3.10.9s3.10.10s3.11.0e3.11.0s3.11.1ae3.11.1e3.11.1s3.11.2e3.11.2s3.11.3ae3.11.3e3.11.3s3.11.4e3.11.4s3.11.5e3.11.6e3.11.7e3.11.8e3.12.0as3.12.0s3.12.1s3.12.2s3.12.3s3.12.4s3.13.0as3.13.0s3.13.1s3.13.2as3.13.2s3.13.3s3.13.4s3.13.5as3.13.5s3.13.6as3.13.6s3.13.7as3.13.7s3.13.8s3.13.9s3.13.10s3.14.0s3.14.1s3.14.2s3.14.3s3.14.4s3.15.0s3.15.1cs3.15.1s3.15.2s3.15.3s3.15.4s3.16.0cs3.16.0s3.16.1as3.16.1s3.16.2as3.16.2bs3.16.2s3.16.3as3.16.3s3.16.4as3.16.4bs3.16.4ds3.16.4s3.16.5s3.16.6bs3.16.6s3.16.7as3.16.7bs3.16.7s3.16.8s3.16.9s3.16.10s3.17.0s3.17.1as3.17.1s3.17.2s3.17.3s3.17.4s3.18.0as3.18.0s3.18.0sp3.18.1asp3.18.1bsp3.18.1csp3.18.1s3.18.1sp3.18.2asp3.18.2s3.18.2sp3.18.3asp3.18.3bsp3.18.3s3.18.3sp3.18.4s3.18.4sp3.18.5sp3.18.6sp3.18.7sp3.18.8asp3.18.9sp16.1.116.1.216.1.316.2.116.2.216.3.116.3.1a16.3.216.3.316.3.416.3.516.3.5b16.3.616.3.716.3.816.3.916.3.1016.3.1116.4.116.4.216.4.316.5.116.5.1a16.5.1b16.5.216.5.316.6.116.6.216.6.316.6.416.6.4a16.6.516.6.5a16.6.616.6.716.6.816.6.916.6.1016.7.116.7.1a16.7.1b16.7.216.7.316.7.416.8.116.8.1a16.8.1b16.8.1c16.8.1d16.8.1e16.8.1s16.8.216.8.316.9.116.9.1a16.9.1b16.9.1s16.9.216.9.316.9.3a16.9.416.9.516.9.5f16.9.616.9.716.9.816.10.116.10.1a16.10.1b16.10.1c16.10.1d16.10.1e16.10.1f16.10.1g16.10.1s16.10.216.10.316.11.116.11.1a16.11.1b16.11.1s16.11.216.12.116.12.1a16.12.1c16.12.1s16.12.1t16.12.1w16.12.1x16.12.1y16.12.1z116.12.1z216.12.216.12.2a16.12.2s16.12.316.12.3a16.12.3s16.12.416.12.4a16.12.516.12.5a16.12.5b16.12.616.12.6a16.12.716.12.816.12.917.1.117.1.1a17.1.1s17.1.1t17.1.317.2.117.2.1a17.2.1r17.2.1v17.2.217.2.317.3.117.3.1a17.3.1w17.3.1x17.3.1z17.3.217.3.2a17.3.317.3.417.3.4a17.3.4b17.3.4c17.3.517.3.5a17.3.5b17.3.617.3.717.4.117.4.1a17.4.1b17.4.217.4.2a17.5.117.5.1a17.5.1c17.6.117.6.1a17.6.1w17.6.1x17.6.1y17.6.1z17.6.1z117.6.217.6.317.6.3a17.6.417.6.517.6.5a17.7.117.7.1a17.7.1b17.7.217.8.117.8.1a17.9.117.9.1a17.9.1w17.9.1x17.9.1x117.9.1y17.9.1y117.9.217.9.2a17.9.317.9.3a17.10.117.10.1a17.10.1b17.11.117.11.1a17.11.99sw

Remediation

Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

Evidence

Each value with its source

Measure	Value	Source
CVSS base scoreHow severe the flaw is in itself. It does not say how likely an attack is.	6.6	NVD
FIRST EPSSFIRST's estimate of the chance this is exploited in the next 30 days, and how that ranks against all CVEs.	0.025 (84.5th pctl)	FIRST EPSS
Actively exploitedWhether a source of record has confirmed attacks using it in the wild.	Confirmed	CISA KEV
Ransomware campaign useWhether CISA has seen ransomware operators use it.	Unknown or none	CISA KEV
CISA remediation deadlineThe date US federal agencies must have fixed or mitigated it.	2023-10-31 · KEV since 2023 · listed over a year	CISA KEV
Public exploit moduleA module existing is not the same as active exploitation.	None known	Metasploit
EUVD cross-referenceENISA's record: CVSS 6.6 (v3.1), assigned by cisco.	Listed	ENISA EUVD

Description

NVD

A vulnerability in the Cisco Group Encrypted Transport VPN (GET VPN) feature of Cisco IOS Software and Cisco IOS XE Software could allow an authenticated, remote attacker who has administrative control of either a group member or a key server to execute arbitrary code on an affected device or cause the device to crash. This vulnerability is due to insufficient validation of attributes in the Group Domain of Interpretation (GDOI) and G-IKEv2 protocols of the GET VPN feature. An attacker could exploit this vulnerability by either compromising an installed key server or modifying the configuration of a group member to point to a key server that is controlled by the attacker. A successful exploit could allow the attacker to execute arbitrary code and gain full control of the affected system or cause the affected system to reload, resulting in a denial of service (DoS) condition. For more information, see the Details ["#details"] section of this advisory.

What CISA says to do