CVE-2016-4979 Details
A vulnerability was found in Apache HTTP Server up to 2.4.20 (Web Server). It has been rated as critical. This issue affects an unknown code block of the component mod_http2. Upgrading to version 2.4.23 eliminates this vulnerability. It is possible to mitigate the problem by applying the configuration setting Protocols http/1.1. The best possible mitigation is suggested to be upgrading to the latest version. A possible mitigation has been published immediately after the disclosure of the vulnerability.
View at NVD
Exploit prediction scoring system (EPSS) score for CVE-2016-4979
EPSS (Exploit Prediction Scoring System): EPSS predicts the likelihood that a vulnerability will be exploited in the wild. A higher percentage means a greater chance of an exploit occurring. The EPSS model produces a probability score between 0 and 1 (0 and 100%).
29.78 Probability of exploitation activity being observed over the next 30 days (96th percentile)
CVSS score for CVE-2016-4979
CVSS (Common Vulnerability Scoring System): An open framework owned and managed by FIRST.Org, Inc. that assigns a numerical score from 0 to 10 to software vulnerabilities to indicate their severity.
7.5 High
Products affected by CVE-2016-4979

CVE-2016-4979 Global Footprint

Top 10 Identified Countries

Country Observations Percentage
US 92,963 31.43%
DE 35,387 11.96%
CA 19,945 6.74%
FR 18,469 6.24%
GB 12,424 4.20%
NL 10,986 3.71%
RU 9,417 3.18%
IE 8,963 3.03%
SG 8,017 2.71%
IN 5,829 1.97%

Is CVE-2016-4979 part of your extended attack surface? Bitsight helps security leaders rapidly identify exposure and detect threats in order to prioritize, communicate, and mitigate risk.

View interactive product tours

CVE-2016-4979 Industry Footprint

Top 10 Identified Industries

*Service provider organizations (typically Technology and Telecommunications) are disproportionally represented in the results given their upstream ownership of end-user infrastructure. See our FAQs.

Industry* Observations Percentage
Technology 209,645 88.03%
Telecommunications 18,490 7.76%
Education 4,125 1.73%
Government/Politics 1,370 0.58%
Business Services 1,229 0.52%
Energy/Resources 675 0.28%
Manufacturing 470 0.20%
Transportation 284 0.12%
Utilities 253 0.11%
Media/Entertainment 225 0.09%

Bitsight, the leading provider in Cyber Risk Management, introduced the next-generation internet scanner Bitsight Groma in May 2024. This technology continuously scans the entire internet to discover assets, collect asset attribution evidence, and identify an ever-growing set of security observations, such as vulnerabilities and misconfigurations. Groma’s scanning activities presently encompass:


  • 40 million-plus monitored organizations
  • 250 million-plus host names
  • 4 billion-plus routable IPv4 and IPv6 addresses

Greynoise’s recent study testifies the speed of Bitsight Groma.

Bitsight data discovery
Governance charcoal background

Bitsight TRACE team investigates security incidents and identifies vulnerabilities and threats.

View latest security research 

See what you’re up against across the expanding attack surface. Prioritize what matters most. And mitigate where you’re most vulnerable.

External Attack Surface Management

Bitsight ASA Report Image

Reducing exposure starts with knowing exactly how your external attack surface stands—from your overall standing to each digital and cloud asset around the world. Bitsight's custom report gives you the insights you need to see your entire external attack surface.