CVE-2019-1740
No exploitation reported by the sources we read.
- Published2019-03-28
- WeaknessCWE-20
Am I affected?
Debian, Ubuntu or Red Hat sometimes backport a fix without changing the upstream version number: such a version reads « to verify », never « affected ».With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.
Description
A vulnerability in the Network-Based Application Recognition (NBAR) feature of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause an affected device to reload. This vulnerability are due to a parsing issue on DNS packets. An attacker could exploit this vulnerability by sending crafted DNS packets through routers that are running an affected version and have NBAR enabled. A successful exploit could allow the attacker to cause the affected device to reload, resulting in a denial of service (DoS) condition.
Timeline
dates in UTC- 2019-03-2800:29CVE publishedNVD
Observed activity
isMalicious corpus · updated 2026-10-23 18:48 UTCBlock these indicators
- Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2019-1740?format=txt
- CSV export: https://api.ismalicious.com/edl/cve/CVE-2019-1740?format=csv
- TAXII collection of exploited CVEs
- The EDL and CSV take an API key on the Pro plan.
Versions per branch
NVD| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 15.3 | = 15.3\(3\)jd | no fix published | NVD |
| 15.3 | = 15.3\(3\)jd2 | no fix published | NVD |
| 15.3 | = 15.3\(3\)jd3 | no fix published | NVD |
| 15.3 | = 15.3\(3\)jd4 | no fix published | NVD |
| 15.3 | = 15.3\(3\)jd5 | no fix published | NVD |
| 15.3 | = 15.3\(3\)jd6 | no fix published | NVD |
| 15.3 | = 15.3\(3\)jd7 | no fix published | NVD |
| 15.3 | = 15.3\(3\)jd8 | no fix published | NVD |
| 15.3 | = 15.3\(3\)jd9 | no fix published | NVD |
| 15.3 | = 15.3\(3\)jd11 | no fix published | NVD |
| 15.3 | = 15.3\(3\)jd12 | no fix published | NVD |
| 15.3 | = 15.3\(3\)jd13 | no fix published | NVD |
| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 3.2 | = 3.2.0ja | no fix published | NVD |
| 3.16 | = 3.16.0as | no fix published | NVD |
| 3.16 | = 3.16.0bs | no fix published | NVD |
| 3.16 | = 3.16.0cs | no fix published | NVD |
| 3.16 | = 3.16.0s | no fix published | NVD |
| 3.16 | = 3.16.1as | no fix published | NVD |
| 3.16 | = 3.16.1s | no fix published | NVD |
| 3.16 | = 3.16.2as | no fix published | NVD |
| 3.16 | = 3.16.2bs | no fix published | NVD |
| 3.16 | = 3.16.2s | no fix published | NVD |
| 3.16 | = 3.16.3as | no fix published | NVD |
| 3.16 | = 3.16.3s | no fix published | NVD |
as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.
Fix
Advisories and patches
- tools.cisco.comPatch · Vendor Advisory
Detection
- Nuclei template
- none so far ProjectDiscovery
- Exploit-DB
- no entry Exploit-DB
- Proof-of-concept repositories
- none listed PoC-in-GitHub
Sources
Technical details
- CVSS v3 Vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
- Published
- 2019-03-28
- Last Modified
- 2026-06-17
- NVD status
- Modified
Frequently asked questions
What is CVE-2019-1740?
Is CVE-2019-1740 actively exploited?
What is the CVSS score for CVE-2019-1740?
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Surveillance reads the versions in your stack — a domain, a lockfile or a list — checks each CVE against the ranges its sources publish, and alerts you when one you run is exploited or enters CISA KEV. A version it cannot read stays « version not verified ».
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